Air friction is not what's causing them to move around. It's static. The static between that plastic fan and those beads is going to be huge. Remove the static and they won't move except for the few that physically come in contact with a fan blade.
@@tv-on-da-gochannel5791 temperature? What’s the effect of temperature on van Der waals forces? Wouldn’t a higher temperature reduce the strength of static attraction by increasing the random assortment of charges and preventing alignment for long enough periods of time?
@@AbhinandanKumar-vq9xv electricity is the movement of charge. Static means not moving, so static electricity is charges that are building up in one spot. If you’ve ever shocked yourself on a car or other metal object, that’s a static charge building up and discharging through you. You can see it in action by rubbing a balloon in your hair then letting go of the balloon (it sticks) or rubbing your feet on carpet and touching someone else or something metal.
@@AbhinandanKumar-vq9xv Static is short for static electricity, which is just electricity not caused by moving charges. In other words it's a static or not moving charge So there's no current involved. Plastic fan will develop a charge as it rotates and the balls develop charge. Opposite charges attract while the same charge repels. So the rotating fan causes a force on the balls. So it's electricity that's moving things around not air.
@Red Nexican My exgirlfriend bought one. It is a sex toy. But she did not want it for her. She wanted to use it on me. When she came in the room looking like a human tripod, she said, "This is for you. It is to hurt you in the best way possible." She clicked the horrible looking elephant trunk wannabe, coated in a thick layer of KY, on and it made a horrible noise, like a car starter. It started to rithe and contort in an evil way. I flew up off the bed, threw on a towel, and ran out the door. I left my clothes, wallet, car, and my keys. I went to a payphone and called a taxi after a couple of miles of running. I never saw my keys, the clothes I was wearing, my wallet, my car, nor her again. No way I was going to risk that horrible Turbomolecular pump again. She could keep all the stuff Ieft. I changed my number and door locks. I had long hair and a goatee. I shaved and got a military crew cut. The woman terrified me after that. Sometimes, when I am sick and have a high fever, I have nightmares with her yelling at me as I am running away saying, "But I was going to put it in only an inch at a time! Come back!"
The beating of the blades against the particles made most of the movement, I think the static probably moved the particles more than the low pressure wind, but not more than the blades beating the particles.
I think he noticed it too and moved his camera so you couldn't see the change in current draw. Why introduce things you don't want to distract the viewer with that takes away from your intended demonstration?
@@Fadamor For me, the voltage/amp number tells most. Put on a graph with a rpm count it would tell the effectiveness of the motor, the engine mechanical vs electrical loss, the real effort going out etc.
The current drops because the back emf increases making the actual voltage in the windings tend to 0. Without the air friction there is actually not much force the motor needs to do and so it just increases speed therotically up to the equilibrium of back emf (characteristics of the motor and speed) match the provided voltage. The inverse is that the current is maximum when the motor is stalled and doing only force with no speed and thus not having back emf. This means the motor has maximum force and current when not rotating. It is why electric cars have fantastic acceleration.
@@PauloNevesPortugal That was a really long paragraph to say, "The lack of parasitic drag in a vacuum requires less current to spin the fan at a given voltage."
no the balls started moving at the end due to the vibrations caused by the motor with that unbalanced fan and the box, the walls of the chamber are what caused the balls to bounce around. the walls transferred the vibrations from the motor to the balls. try this again with no static and no vibrations and you will get real results. You need less variables.
You might mention the fan draws less current as the vacuum is introduced as the drag on the blades is reduced. The same thing happens when one covers a vacuum cleaners nozzle and hears the motor speed up considerably though many think the fan is slowing. It is not!! Thanks for the video!
The comment about the movie the "The Martian" was really misleading though. The atmosphere is so thin that it would NEVER actually tip or jeopardize a space craft. Even the worst of storm would barely wave a flag. The writer of "The Martian" even noted that he knew it didn't make and sense but it worked for a good story.
So basically what your saying is rockets don't work in space! Rockets cannot propel themselves without any atmosphere to push off. Space travel is a lie
@@phylthamendment Laws of motion still apply. Rockets essentially throw fuel out that back, which means an equal and opposite force is applied, pushing the rocket forwards. You can try this with a skateboard or roller skates, throw something heavy in one direction and you will move in the opposite. No atmosphere required
Go all out on what static electricity would do in this situation. Take out all the humidity of the air by lining the bottom of the chamber with silica gel (under a permeable membrane), put in styrofoam balls and leave under vacuum overnight. Use something like brass for the fan blade material. Then rub a cat against the outside of the chamber. Then my life will be complete.
The answer should be a resounding no. In a vacuum, the fan can't push/pull anything, as there is no medium to push them through. Any result that is different means you didn't control for some variable
That should be the case, yes. But only in a _complete_ vacuum, which this test was not conducted under. If you watched to the very end, he explained how the chamber was not in a _complete_ vacuum, meaning that some gas remained inside. That's why the fan had to run at a mucher higher speed in order to overcome the drag of the styrofoam beads, causing them to fly through the air. If this test was conducted in a _much greater_ vacuum, using a turbomolecular pump, the fan likely would not have been able to do anything, such as in your explanation. There are different levels of vacuum, and only a _complete_ vacuum has no gas whatsoever in it.
What I found interesting, that isnt mentioned, the amperage is going down as the vacuum increases. This makes sense since as the pressure goes down, so does the lift and drag acted upon the spinning blades. This in turn reduces the amount of force needed to rotate the blades. Thus, less energy/electricity needed to spin the blades at a given voltage. Thanks for the vid!
Another cool side effect of pumping air out of the chamber is , when you observe amperage on lab bench power supply - it is dropping due to less drag on fan itself. Nice experiment!
@@ahmedejaz1125 That would have been an increase in amps due to higher resistance. What we saw was a reduction in amps because the fan was spinning more freely. =]
Fun Fact: Andy Weir, the author of The Martian, stated himself, that one of the only nonscientific plots in his book were, that the atmosphere on mars would be too thin ,as that a windstorm could have overthown the startmodule. He put it in anyway because of no better explanation why the crew would had to abondon mars. ;)
Couldn't he have put in one of those planet wide dust storms that last for long periods of time? o: Just curious (: I'm sure he thought of a lot of possibilities, but I wonder if that crossed his mind too (:
@@revenge12212012 I guess not. A long lasting sandstorm would be a problem because of lack of sunlight for the solar panels. At the other hand that would mean Mark Watney would have died after a few days, probably due to hypothermia.
@@leonmuller1702 that makes sense (: hmm, what if it were like an unforeseen dust storm (not planet wide) that only lasted for about a week and made the crew leave, leading to the main character's circumstances, do you think that'd be possible? o:
@@revenge12212012 The problem is why they would leave Mark alone on mars. If dust were the problem, there wouldn´t be a need to rush and let a injured alone.
@Lassi Kinnunen 81 If there was a landslide and one were buried they could just use his biomonitor which is sending signals to find him. A welding fraud on the one hand has tro be severe enough, that the crew couddn´t fix it, in which case the lonely astronaut couldn´t either, Or at the other hand it would be fixable like the accident with the pressure gate in the book. In either case there wouln´t be a reason to abondon mars and leave one crewmember alive and alone back there.
On Mars, the wind would very little force on any of the equipment that was seen in the Martian. Basically it couldn't happen. Now. 4km/h wind on Venus would be pretty powerful.
That's a good point if we only consider the rho of the gases. If we increase rho by adding in the dust being carried in the wind, it might be a bit different. I don't know of any experiments that have run with that in mind, but it's not hard to imagine dust moving along with the wind at 30mps will generate a substantial force.
The DRAG force increases with the square of velocity. While the drag coefficient does change with velocity, if drag coefficient increased with the square of velocity, drag force would increase with the fourth power of velocity which is not the case.
3:52, *If we see carefully those beads were in vacuum and they were hitting each other and the chain reaction increases untill a time comes when every bead is moving even in vacuum, well that's what the ideal gas molecules do, the air pressure inside a jar exerted to the surface of its inner wall is due to the fully elastic collisions, which keeps them from collapsing into a single point... I know there's no connection with that thing to the beads here, but hey the beads were hitting each other and that hitting cause collisions among the beads themselves, thus constantly keeping the pressure and eventually taking the whole volume of the vacuum chamber inside, just like gas molecules... But here's a point! The collisions here are not at all elastic but they're constantly getting their kinetic energy from that spinning fan by hitting into its blades, that's kinda giant model of how the ideal gas molecules behave when they're inside a closed chamber, and how they keep their pressure...* _I know many guys will not even read till this much..._ 😂😂😂🤣🤣🤣🤣
They are bloody expensive. That, and i'd rather not trust anything cheap when it comes to spinning at 300k RPMs. Maybe renting one for a short time for a miniseries would be a viable option.
Considering the one that he has and the lowest it can go.. It's damn good. And anyways he doesn't need to invest huge dollars on turbo-molecular pump 😅 For regular experiments his vaccum pump is great enough! 😁
I would surmise that it’s not the remaining air but the fact that at zero humidity the static on the beads makes them get attracted to the fan? As one goes through it pulls others in a cascading effect. Interesting to try with beads that don’t have that annoying property that makes polystyrene packaging stick to you when your Amazon delivery is opened!
I think you should have done another one and replaced the beads with streamers hanging from the top so there’s nothing to pick up and throw around in the chamber, only the effects of the remaining air molecules on the streamers.
I would assume that even the smallest quantity of air could topple a ship on its side but it would need to be blowing VERY fast, don't know if it was going fast enough in the movie tho
It wasn't just air, you know? It was also sand, dust and debris which at high speeds can build up tonnes of force when hitting against a static object like a ship. That and the fact that science fiction is not the same as applied science.
@@sebastianortega1938 You would have the same problem with the sand, the air is too thin to do a very good job of blowing that around, only the tinier particles get pushed around. Velocity can overcome that, which is why the Mars helicopter's blades will spin super-fast. Anyway, the Mars rovers did get dust on them, fine like talcum powder. I don't know why they didn't build vibrators into the solar panels to shake the dust off.
The motor was sitting on the bottom of the chamber, you most likely created a harmonic resonance which caused the foam balls to vibrate and get hit by the fan blades.
Given that there is no air for the fan to push, there's really no load on the motor. This was my first thought as well, but I guess the only way it would overheat would be through friction.
@@FallLineJP At the end it looks like it dissipates 18V, 1,5A though it cannot be clearly seen. A whopping 24W compared to the nominal 660mW. Since also air cooling is lost, I'd say this test would end up in smoke when prolonged. But the less than a watt nominal consumption won't heat anything that big and heavy to destruction.
@@FallLineJP the friction is created by the magnetic fields that turn the fan. Turn a motor by hand. They dont spin freely. They start and stop. That's from the fixed magnets. That will cause friction even in a vacuume from my understanding. Eg induction heating.
The resistance inherant to the copper windings in the motor generate heat regardless of motor resistance. My guess is the heat build up warmed the output shaft so high that it started to transition the plastic blades towards a liquid, breaking the static friction holding the fan blade on the motor output shaft and allowing it to fly off. I’m pretty impressed that the motor seemed to survive that abuse.
I wonder if some of that movement was created by the vibrations of the fan motor because of the seeming harmonic movement of the beads close to and around the motor instead of the wildly flying movement in all directions. 🤔
Two observations: 1 - It is very interesting to see the motor current decreasing with the increase of the vacuum rising due to the decrease of the load on the motor. 2 - It is very likely that the pieces of Styrofoam are jumping in the vacuum due to vibration of the motor at the bottom of the vacuum chamber. The sound propagating in the camera is the main support of this thesis. When the propeller detaches, the sound disappears. This propeller is probably unbalanced and caused high RPM vibration.
Interesting video. As the air got thinner there would be less force from moving air if the fan were at constant speed. However, in thinner air the fan will go faster for the same applied voltage. That effect, combined with a higher applied voltage accounted for the fan being able to move the beads around even at such a low pressure. It would be interesting to know how fast that fan was turning just before the blade flew off.
It was just the motor's vibrations being transferred to the floor of the chamber, then to the balls, making them jiggle more and more as the motor voltage increased. He over-drove that little 3V motor with far too much voltage, causing pretty severe vibrations on the chamber floor. The motor was stressed far beyond its 3V design limit. The tiny amount of air did virtually nothing.
@@mr.waffentrager4400 I agree, I wanted to see how the fans speed increases as the air is pumped out and it has less and less air to push it of its way
Isn't there a fair degree of static charge being generated by the fan on the nearby beads causing the others to become charged in a cascade effect contributing to the motion?
There was probably a lot of static, but static can't cause motion like that, since there isn't a driving force to keep them circulating like they did, they would've just jumped around a lot.
In my opinion. He was unable to creat high vacuum close to absolute. Thats y at high RPM fan manage to lift the particles. Because there is still some air left.
hm ....there is less load on the motor due to no drag on the fan , so i was asking for the amperage drop of the motor once he starts evacuating the chamber . but .....it has still the abilty to heatsink into the motor and radiate the heat away in the ir spektrum ....i would suggest that the heat is less a problem from a electric field in the motor than from the friction of the bearings over time , because the grease would evaporate in an atmosphere lower than 20 mbar if it is not a special vacuum rated grease . and second point is that under vacuum conditions ( or was it a combination of vacuum and low gravity ? not sure about this now ) that soldering tin is tending to grow some kind of spikes ( on small circuit boards ) and can create shortcuts on its own ?
In addition to the turbo molecular pump is the diffusion pump, which is commonly used to draw vacuums down to 10^-6 Torr, where a Torr is 1 mm Hg or 1/760 Atm or 133 Pa. The diffusion pump works by creating a stream of oil vapor that pushes the molecules of air from the vacuum chamber away from the vacuum chamber and those air molecules are replaced by more molecules from the vacuum chamber via diffusion from the vacuum chamber to the oil vapor.
Ozone chemically takes 3 Oxygen Molecules and produces 2 Ozone molecules, so the generation of Ozone does not increase pressure. Good guess, but the chemistry math does not support the theory. It is more likely as possibilities, the lack of cooling increased the heat and the bearings, or windings broke down and released some of the magic smoke. When the motor was at very high speed, hitting the pellets, may have broken some of the cells of Styrofoam, liberating the trapped gas. With very little Oxygen present, I don't think that there was much Ozone at all. I would like to see a repeat of the experiment with a high vacuum gauge on the chamber to see the pressure rise when the snowglobe effect returned. I think that was due to a pressure rise. An electric arc from a plasma globe coil can provide the color of ionization to provide a spectrum of the gasses present. I suspect the gas would contain the gas used to form the foam beads.
The motor with the fan was vibrating and causing the beads to fly around. Some were hitting the blades and it appeared that they are actually flying. You need to hang the fan and repeat the same experiment.
Those balls must have been open-cell foam; if they were closed-cell foam, they would have swollen up under vacuum. (Interesting experiment maybe for a guy with a transparent vacuum chamber.)
In reality, there is no such thing. A Vacuum is never zero. There are always some molecules. NDT explains here. ua-cam.com/video/lcYPL3s2Mmw/v-deo.html
You actually had a crude turbo pump there with that fan spinning. If you could have gotten up to, say 30,000 RPM (and provided a passage out) you would have kept pumping. You don't really need a turbo pump, though. You could do this experiment with a diffusion pump and get low enough to stop all bead motion due to air drag. I've worked in HiVac for decades, and I'm surprised that motor continued to run. Motors overheat very quickly in a vacuum without air to cool them, plus, if that's a brush-type motor, the carbon starts oxidizing with the little air still in there, stopping any current flow.
This is a very interesting demo! Thanks. It illustrates why it's difficult to get a helicopter to work on Mars. We'll see that in operation in a few weeks.
This is what I was thinking too. They’re full of air, and as the vacuum got stronger they outgassed causing all sorts of crazy interactions with the fan, static, pressure, and other beads.
These are absolutely NOT weird results. The beads gained a static charge and the motor had increasing magnetic forces that attracted the charged beads to its rotor, eventually propelling them until they began to bounce each other more and more with increase in voltage. Ps. Mars has an atmosphere, it's just not oxygenated.
The atmosphere on Mars is also extremely thin and less than 1% of Earth's. It would have taken winds blowing several thousand kph to have the effect shown on "The Martian". The highest wind speeds recorded on Mars are around 160 kph which would be just enough to lift a flag.
I was expecting to see the motor melt. Heat produced by the motor has no atmosphere for cooling. A motor rated at 3 volts driven by 17 volts, probably fried the motor. The only reason I watched this was for the weird results. There were none.
No one mentioned the power consumption. When he was sucking air out, the fan got less resistance from the air and you can see the power consumption lowering.
Cool. You could also slice up a dryer sheet into tiny pieces (about a quarter sheet) and throw it into the box. It would remove all the static. My kids had a dyson toy vacuum with tiny foam balls. Worked like a charm.
The static electric fields on the nonconducting beads and fan were interacting to push the beads around. Try this again with a metal fan.
👌
*Science noises*
👌
👌
👌
0:21 " I can adjust the speed of it "
* Minecraft cow sound *
Underrated
I hear it normally...
real life cow* (or just cow) , not minecraft
Overrated
rated
Air friction is not what's causing them to move around. It's static. The static between that plastic fan and those beads is going to be huge. Remove the static and they won't move except for the few that physically come in contact with a fan blade.
Great mention,, temperature would then also help dictate the volatility and level (ie, amount) of static that'd come into play
@@tv-on-da-gochannel5791 temperature? What’s the effect of temperature on van Der waals forces? Wouldn’t a higher temperature reduce the strength of static attraction by increasing the random assortment of charges and preventing alignment for long enough periods of time?
What's static?
@@AbhinandanKumar-vq9xv electricity is the movement of charge. Static means not moving, so static electricity is charges that are building up in one spot. If you’ve ever shocked yourself on a car or other metal object, that’s a static charge building up and discharging through you.
You can see it in action by rubbing a balloon in your hair then letting go of the balloon (it sticks) or rubbing your feet on carpet and touching someone else or something metal.
@@AbhinandanKumar-vq9xv
Static is short for static electricity, which is just electricity not caused by moving charges. In other words it's a static or not moving charge So there's no current involved. Plastic fan will develop a charge as it rotates and the balls develop charge. Opposite charges attract while the same charge repels. So the rotating fan causes a force on the balls. So it's electricity that's moving things around not air.
“This fan is supposed to run at 3 Volts”
“Let me just turn it up a bit”
45..46...47.......48
4.8 piss wipe
@@jinxx_z5125 wtf are you trying to say? Are you roasting me
It maxed out at 20V lol
@@PorWik that’s not what matters
........
kaboom...
Title:
"What Does a Fan Do in a Vacuum Chamber?"
Me:
he runs out of air
and go FAT
... and it'll spin for no purpose! 😅
3:50 .... This is what happens when you give 5 assignments for 6 subjects each and ask them to complete it in a week.
😂😂😂
So true
😂😂😂
And you go Super Saiyan
You must be an engineering student
"Turbomolecular Pump" would be a cool band name.
Lil’ Turbomolecular Pump
@Red Nexican My exgirlfriend bought one. It is a sex toy. But she did not want it for her. She wanted to use it on me. When she came in the room looking like a human tripod, she said, "This is for you. It is to hurt you in the best way possible." She clicked the horrible looking elephant trunk wannabe, coated in a thick layer of KY, on and it made a horrible noise, like a car starter. It started to rithe and contort in an evil way. I flew up off the bed, threw on a towel, and ran out the door. I left my clothes, wallet, car, and my keys. I went to a payphone and called a taxi after a couple of miles of running. I never saw my keys, the clothes I was wearing, my wallet, my car, nor her again. No way I was going to risk that horrible Turbomolecular pump again. She could keep all the stuff Ieft. I changed my number and door locks. I had long hair and a goatee. I shaved and got a military crew cut. The woman terrified me after that. Sometimes, when I am sick and have a high fever, I have nightmares with her yelling at me as I am running away saying, "But I was going to put it in only an inch at a time! Come back!"
@@indridcold8433 lol wtf
or album name.
@@indridcold8433
don't lie, you loved it.
where did you find a "pay phone"
I wonder how much of that was being moved around just from static
exactly
The beating of the blades against the particles made most of the movement, I think the static probably moved the particles more than the low pressure wind, but not more than the blades beating the particles.
The word static literally means doesn’t move lol
@@shokdj1 lol.. true.
Entirely, lmao.
Notice how your fan started pulling less and less amps when the air resistance went down?
That's the only meaningful result of this video
I think he noticed it too and moved his camera so you couldn't see the change in current draw. Why introduce things you don't want to distract the viewer with that takes away from your intended demonstration?
@@Fadamor For me, the voltage/amp number tells most. Put on a graph with a rpm count it would tell the effectiveness of the motor, the engine mechanical vs electrical loss, the real effort going out etc.
The current drops because the back emf increases making the actual voltage in the windings tend to 0. Without the air friction there is actually not much force the motor needs to do and so it just increases speed therotically up to the equilibrium of back emf (characteristics of the motor and speed) match the provided voltage. The inverse is that the current is maximum when the motor is stalled and doing only force with no speed and thus not having back emf. This means the motor has maximum force and current when not rotating. It is why electric cars have fantastic acceleration.
@@PauloNevesPortugal That was a really long paragraph to say, "The lack of parasitic drag in a vacuum requires less current to spin the fan at a given voltage."
no the balls started moving at the end due to the vibrations caused by the motor with that unbalanced fan and the box, the walls of the chamber are what caused the balls to bounce around. the walls transferred the vibrations from the motor to the balls. try this again with no static and no vibrations and you will get real results. You need less variables.
I was about to suggest that this could have been a factor, too.
Agreed
Wow but its just minor factor. Notice at 15V those balls at surface rotating along the direction of fan.
You need "fewer" variables...
😁
🇺🇸
What does a fan do in a vacuum chamber?
It spins.
bj
The question is how fast ...
If they're a fan of Papa Roach, they suffocate.
_Suffocation, no breathing, don't give a f*** if I cut my arm bleeding._
Man why didn't I think of that
I expected the fan to increase in speed due to lower air resistance.
Could you line the interior with a grounded "wire-mesh" and redo the experiment? Would like to see the results without static interfering...
Of course under vacuum some beads were simply bouncing off the walls and being thrown back by the blades, not air currents.
i think static electricity was making them move too
Agreed. The increased magnetic field would affect anything with a static charge.
Show off!!😀😂
Henning Idsøe seriously? 😑 Are you stupid or something
This is 'fan'-tastic! I'm a fan now but please don't put me in a vacuum chamber, thanks.
Very punny
You might mention the fan draws less current as the vacuum is introduced as the drag on the blades is reduced. The same thing happens when one covers a vacuum cleaners nozzle and hears the motor speed up considerably though many think the fan is slowing. It is not!! Thanks for the video!
The comment about the movie the "The Martian" was really misleading though. The atmosphere is so thin that it would NEVER actually tip or jeopardize a space craft. Even the worst of storm would barely wave a flag. The writer of "The Martian" even noted that he knew it didn't make and sense but it worked for a good story.
Right- THATS what is absurdly silly about the movie The Martian.
So basically what your saying is rockets don't work in space!
Rockets cannot propel themselves without any atmosphere to push off.
Space travel is a lie
@@phylthamendment Laws of motion still apply. Rockets essentially throw fuel out that back, which means an equal and opposite force is applied, pushing the rocket forwards. You can try this with a skateboard or roller skates, throw something heavy in one direction and you will move in the opposite. No atmosphere required
@@phylthamendment the rockets push off the fuel they propel.
@@phylthamendment Well, this shows a complete ignorance of fundamental physics.
'The Fan Has Hitten The Balls". Sounds like a new expression.
UA-cam: do you want to watch a fan in a vacuum chamber?
Me: How could I say no
Never thought about it but hey, I mean how can I say no?
Fucking same mate
Go all out on what static electricity would do in this situation. Take out all the humidity of the air by lining the bottom of the chamber with silica gel (under a permeable membrane), put in styrofoam balls and leave under vacuum overnight. Use something like brass for the fan blade material. Then rub a cat against the outside of the chamber.
Then my life will be complete.
'rub a cut' - comedic genius!
This comment deserves more likes
That laughable, if in a vacuum there is no humidity, or it is not a vacuum.
yeah the cat would prolly jump on it
@Todd Thompson My corona got healed after I did that, thanks.
The answer should be a resounding no. In a vacuum, the fan can't push/pull anything, as there is no medium to push them through. Any result that is different means you didn't control for some variable
That should be the case, yes. But only in a _complete_ vacuum, which this test was not conducted under. If you watched to the very end, he explained how the
chamber was not in a _complete_ vacuum, meaning that some gas remained inside. That's why the fan had to run at a mucher higher speed in order to
overcome the drag of the styrofoam beads, causing them to fly through the air. If this test was conducted in a _much greater_ vacuum, using a turbomolecular pump,
the fan likely would not have been able to do anything, such as in your explanation. There are different levels of vacuum, and only a _complete_ vacuum has no gas whatsoever in it.
@Fizzle
Hi , is there a medium in space ???
What I found interesting, that isnt mentioned, the amperage is going down as the vacuum increases. This makes sense since as the pressure goes down, so does the lift and drag acted upon the spinning blades. This in turn reduces the amount of force needed to rotate the blades. Thus, less energy/electricity needed to spin the blades at a given voltage. Thanks for the vid!
The same happens in a vacuum cleaner if you block the intake hose. The motor fan starts to spin faster as it has less air resistance (vacuum).
Another cool side effect of pumping air out of the chamber is , when you observe amperage on lab bench power supply - it is dropping due to less drag on fan itself. Nice experiment!
When the camera moved I was thinking “no, no, go back I want to watch the amperage” lol
It can also be because as there was no air to drain the heat from motor the wires got hot and resistance increased.
@@ahmedejaz1125 That would have been an increase in amps due to higher resistance. What we saw was a reduction in amps because the fan was spinning more freely. =]
@@LocoHosa no when resistance increases current decreases because I=V/R so I is inversely proportional to R if voltage is constant.
@@ahmedejaz1125 Actually the Voltage was not constant. it changed from 3v to 17v so V=IR does not apply in this case.
Old McDonald had a farm
E-I-E-I-O
And on his farm he had a cow
E-I-E-I-O
With a 0:24 0:24 here
And 0:24 0:24 there
E-I-E-I-O
LOL
Here a moo there a moo every where a moo moo
You've made my day
whoa
This deserves an award for the most random thing someone has tought with a buzz sound
Notice how the motor's current draw was dropping as the vacuum was created.
the produced heat however cannot disapate quite as well.
I've seen that too, but at 2:05 he moved the camera-angle so we dindn't see what the current was at minimum pressure.
@Darth Wheazius exactly what I was about to say
@Darth Wheazius
That's what I was wondering too.
@Darth Wheazius
I feel it haha.
Good luck if you get to test it. Should be interesting.
Fun Fact: Andy Weir, the author of The Martian, stated himself, that one of the only nonscientific plots in his book were, that the atmosphere on mars would be too thin ,as that a windstorm could have overthown the startmodule. He put it in anyway because of no better explanation why the crew would had to abondon mars. ;)
Couldn't he have put in one of those planet wide dust storms that last for long periods of time? o: Just curious (: I'm sure he thought of a lot of possibilities, but I wonder if that crossed his mind too (:
@@revenge12212012 I guess not. A long lasting sandstorm would be a problem because of lack of sunlight for the solar panels. At the other hand that would mean Mark Watney would have died after a few days, probably due to hypothermia.
@@leonmuller1702 that makes sense (: hmm, what if it were like an unforeseen dust storm (not planet wide) that only lasted for about a week and made the crew leave, leading to the main character's circumstances, do you think that'd be possible? o:
@@revenge12212012 The problem is why they would leave Mark alone on mars. If dust were the problem, there wouldn´t be a need to rush and let a injured alone.
@Lassi Kinnunen 81 If there was a landslide and one were buried they could just use his biomonitor which is sending signals to find him. A welding fraud on the one hand has tro be severe enough, that the crew couddn´t fix it, in which case the lonely astronaut couldn´t either, Or at the other hand it would be fixable like the accident with the pressure gate in the book. In either case there wouln´t be a reason to abondon mars and leave one crewmember alive and alone back there.
3:50
my man: *turns it to the max voltage
fan: adios
„It’s supposed to be around three volts, I think it got to 17“ lol
RIP poor little motor ...
rip unbalanced fan blade, couldnt handle the increased rpm and eventually vibrated off the shaft.
On Mars, the wind would very little force on any of the equipment that was seen in the Martian. Basically it couldn't happen. Now. 4km/h wind on Venus would be pretty powerful.
That's a good point if we only consider the rho of the gases. If we increase rho by adding in the dust being carried in the wind, it might be a bit different. I don't know of any experiments that have run with that in mind, but it's not hard to imagine dust moving along with the wind at 30mps will generate a substantial force.
Using the metal of the outlet and meter as an electrical conductor is pretty inspired!
Inspired?
I appreciate how you simply started the experiment without 20 minutes of introduction. Good job!
4:41 pretty much BLEWED his ship over.
I'm a boy and all but you are absolutely adorable haha
"Men don't cry ! "
I cried when the fan broke
4:00 Sir Nikola Tesla
I domt get it explain pls
@@hoodrichyb5372 with a mustache and no beard he looks like the great scientist Nikola Tesla
This made me sound like a car engine reming up
I saw the title and I thought, "wow! he doesn't like his fans very much."
😂 I see what you did there
This comment is very underrated
I'm the hundreth like, now 😎
Am I a cheap fan? :(
@elgur joke???
Using your inlet and outlet valves to conduct electricity was freaking brilliant!
Yeah lol
The DRAG force increases with the square of velocity. While the drag coefficient does change with velocity, if drag coefficient increased with the square of velocity, drag force would increase with the fourth power of velocity which is not the case.
"With many awful facts about the scary hippopotamus..."
🇺🇸
Just I wanted to say that the new UA-cam comments list is the Worst thing they did ever
Agreed
Isn't it easier to reach now?
Agreed
@@davidlegkodukh6969 No because I was accustomed to the old one, but maybe for you
Yeah it sucks. They tried it before and the reverted back to the old format, now they've done it again.
You are one of the most educational channel on youtube, your channel is great, keep up the great work!
ROBUX
3:52, *If we see carefully those beads were in vacuum and they were hitting each other and the chain reaction increases untill a time comes when every bead is moving even in vacuum, well that's what the ideal gas molecules do, the air pressure inside a jar exerted to the surface of its inner wall is due to the fully elastic collisions, which keeps them from collapsing into a single point... I know there's no connection with that thing to the beads here, but hey the beads were hitting each other and that hitting cause collisions among the beads themselves, thus constantly keeping the pressure and eventually taking the whole volume of the vacuum chamber inside, just like gas molecules... But here's a point! The collisions here are not at all elastic but they're constantly getting their kinetic energy from that spinning fan by hitting into its blades, that's kinda giant model of how the ideal gas molecules behave when they're inside a closed chamber, and how they keep their pressure...*
_I know many guys will not even read till this much..._ 😂😂😂🤣🤣🤣🤣
Thanks you explain better than my teacher
The way he passed the energy into the chamber is incredible
I thought exactly the same thing after the split second it took to figure out why the alligator clips.
Any plans to get the turbomolecular pump? I think you should own one :D
They are bloody expensive. That, and i'd rather not trust anything cheap when it comes to spinning at 300k RPMs.
Maybe renting one for a short time for a miniseries would be a viable option.
What's that
Considering the one that he has and the lowest it can go..
It's damn good.
And anyways he doesn't need to invest huge dollars on turbo-molecular pump 😅
For regular experiments his vaccum pump is great enough! 😁
He could also just build a mercury powered vacuum pump like CodysLab did. It creates a near perfect vacuum
Around 600 dollars
I would surmise that it’s not the remaining air but the fact that at zero humidity the static on the beads makes them get attracted to the fan? As one goes through it pulls others in a cascading effect. Interesting to try with beads that don’t have that annoying property that makes polystyrene packaging stick to you when your Amazon delivery is opened!
I think you should have done another one and replaced the beads with streamers hanging from the top so there’s nothing to pick up and throw around in the chamber, only the effects of the remaining air molecules on the streamers.
4:17-4:19 😂 man. Okay back to the topic
Thought I was the only one who noticed lol
0:22
"I actually have my fan on here and I can adjust the speed of it.."
Fan: *MOOOO*
Nobody:
Literally Nobody:
My ps4: When i turn it on 3:40
The air is too thin on Mars to blow the ship over, it's one of the few mistakes the movie made.
I would assume that even the smallest quantity of air could topple a ship on its side but it would need to be blowing VERY fast, don't know if it was going fast enough in the movie tho
Andy Weir already acknowledged that it's one of the few mistakes that were made in the story
It wasn't just air, you know? It was also sand, dust and debris which at high speeds can build up tonnes of force when hitting against a static object like a ship.
That and the fact that science fiction is not the same as applied science.
@@sebastianortega1938 You would have the same problem with the sand, the air is too thin to do a very good job of blowing that around, only the tinier particles get pushed around. Velocity can overcome that, which is why the Mars helicopter's blades will spin super-fast. Anyway, the Mars rovers did get dust on them, fine like talcum powder. I don't know why they didn't build vibrators into the solar panels to shake the dust off.
Still an awesome movie!
The background music sound like your in the middle of a gta 5 mission 😂
I like the way you transferred the electricity into the box to the motor.
Exactly what I expected would happen happened, and yet I’m still impressed.
The motor was sitting on the bottom of the chamber, you most likely created a harmonic resonance which caused the foam balls to vibrate and get hit by the fan blades.
I was wondering how quickly the fan would break because of no air cooling.
Given that there is no air for the fan to push, there's really no load on the motor. This was my first thought as well, but I guess the only way it would overheat would be through friction.
@@FallLineJP At the end it looks like it dissipates 18V, 1,5A though it cannot be clearly seen. A whopping 24W compared to the nominal 660mW. Since also air cooling is lost, I'd say this test would end up in smoke when prolonged. But the less than a watt nominal consumption won't heat anything that big and heavy to destruction.
@@FallLineJP the friction is created by the magnetic fields that turn the fan. Turn a motor by hand. They dont spin freely. They start and stop. That's from the fixed magnets. That will cause friction even in a vacuume from my understanding.
Eg induction heating.
@@FallLineJP Friction and the wires heating up because of the high current going through them.
The resistance inherant to the copper windings in the motor generate heat regardless of motor resistance. My guess is the heat build up warmed the output shaft so high that it started to transition the plastic blades towards a liquid, breaking the static friction holding the fan blade on the motor output shaft and allowing it to fly off. I’m pretty impressed that the motor seemed to survive that abuse.
I wonder if some of that movement was created by the vibrations of the fan motor because of the seeming harmonic movement of the beads close to and around the motor instead of the wildly flying movement in all directions. 🤔
Enjoyed it....... Loved it..... Now I know why wind 🌬blows in vaccum... Cuse it's not a perfect vacuum... Keep making such kind of videos
Two observations:
1 - It is very interesting to see the motor current decreasing with the increase of the vacuum rising due to the decrease of the load on the motor.
2 - It is very likely that the pieces of Styrofoam are jumping in the vacuum due to vibration of the motor at the bottom of the vacuum chamber. The sound propagating in the camera is the main support of this thesis. When the propeller detaches, the sound disappears. This propeller is probably unbalanced and caused high RPM vibration.
This is the first time I've ever seen you with a mustache!
Thanks for this, I'm taking a short trip to the Sun next week and now know not to pack my handheld fan
Dont forget to go at night so its not that hot when you reach the sun🤣🤣
"The fan is actually hitting the balls"
Good to know.
Instructions unclear...
Interesting video. As the air got thinner there would be less force from moving air if the fan were at constant speed. However, in thinner air the fan will go faster for the same applied voltage. That effect, combined with a higher applied voltage accounted for the fan being able to move the beads around even at such a low pressure. It would be interesting to know how fast that fan was turning just before the blade flew off.
I like how you eliminated the need to drill through the chamber for the motor cable.
Was it the air that made the balls fly around, or was it the motor's vibration?
I think its the vibrations of the motor too as the balls stayed on the floor and only jumped when the vibrations where high enough to make them bounce
Static charges
It was just the motor's vibrations being transferred to the floor of the chamber, then to the balls, making them jiggle more and more as the motor voltage increased.
He over-drove that little 3V motor with far too much voltage, causing pretty severe vibrations on the chamber floor. The motor was stressed far beyond its 3V design limit.
The tiny amount of air did virtually nothing.
1:07 “WILL YOU START THE FANS PLEASE!”
"drag on those balls"
*Subscribed*
Visually helped my understand the Mars drone making video.
Who would have thought that a fan wouldn't work without air? Nobel prize worthy!
🤔
The vibration causes movements. Static may also be affecting the results but the vibration is the active agent here.
Would’ve been a little better if he had the fan facing the other way
Also if he measured rpm in air and in vacuum
Ha Ha Ha..
@@mr.waffentrager4400 I agree, I wanted to see how the fans speed increases as the air is pumped out and it has less and less air to push it of its way
Inverse thinking.
Isn't there a fair degree of static charge being generated by the fan on the nearby beads causing the others to become charged in a cascade effect contributing to the motion?
Running the fan before pulling the vacuum built up quite a static charge around everything in that box. Should do the test without the buildup.
If that theory is right, the beads might have circulated, even if he could pull the vacuum of deep space! It DOES sound plausible.
There was probably a lot of static, but static can't cause motion like that, since there isn't a driving force to keep them circulating like they did, they would've just jumped around a lot.
This channel should be called the vacuum channel 😂
Am....am I watching you put an electrical current through your valve and pressure gage?????🤣🤣🤣 I love it yes!!🤣🤣
My fans would die if i left them in a vacuum chamber for more than 5 minutes.
And your enemies would too..
In my opinion.
He was unable to creat high vacuum close to absolute.
Thats y at high RPM fan manage to lift the particles. Because there is still some air left.
Technically the windings in the motor should fry out in a vacuum.
Why
@@DancePartyAttack There's no air to draw away the heat generated by the motor.
hm ....there is less load on the motor due to no drag on the fan , so i was asking for the amperage drop of the motor once he starts evacuating the chamber .
but .....it has still the abilty to heatsink into the motor and radiate the heat away in the ir spektrum ....i would suggest that the heat is less a problem from a electric field in the motor than from the friction of the bearings over time , because the grease would evaporate in an atmosphere lower than 20 mbar if it is not a special vacuum rated grease .
and second point is that under vacuum conditions ( or was it a combination of vacuum and low gravity ? not sure about this now ) that soldering tin is tending to grow some kind of spikes ( on small circuit boards ) and can create shortcuts on its own ?
Beezer Twelve Washingbeard ...And the Most Scientific Comment Award goes to--
it's 3 AM and i need to sleep. thanks for answering my deep question mate :D
In addition to the turbo molecular pump is the diffusion pump, which is commonly used to draw vacuums down to 10^-6 Torr, where a Torr is 1 mm Hg or 1/760 Atm or 133 Pa. The diffusion pump works by creating a stream of oil vapor that pushes the molecules of air from the vacuum chamber away from the vacuum chamber and those air molecules are replaced by more molecules from the vacuum chamber via diffusion from the vacuum chamber to the oil vapor.
3:49 it went from normal to Super Saiyan
Also, with a brushed motor being driven that hard, there are gasses being created by arcing, includine Ozone.
Ozone chemically takes 3 Oxygen Molecules and produces 2 Ozone molecules, so the generation of Ozone does not increase pressure. Good guess, but the chemistry math does not support the theory. It is more likely as possibilities, the lack of cooling increased the heat and the bearings, or windings broke down and released some of the magic smoke. When the motor was at very high speed, hitting the pellets, may have broken some of the cells of Styrofoam, liberating the trapped gas. With very little Oxygen present, I don't think that there was much Ozone at all. I would like to see a repeat of the experiment with a high vacuum gauge on the chamber to see the pressure rise when the snowglobe effect returned. I think that was due to a pressure rise. An electric arc from a plasma globe coil can provide the color of ionization to provide a spectrum of the gasses present. I suspect the gas would contain the gas used to form the foam beads.
The motor with the fan was vibrating and causing the beads to fly around. Some were hitting the blades and it appeared that they are actually flying. You need to hang the fan and repeat the same experiment.
Nothing. A fan does nothing in a vacuum. Thanks for coming to my TED talk.
I agree with many of the comments. Electrostatic effects increased parallel to the fan speed. Other factors were also at play.
Did any vibration coming off of the motor or the base possibly cause any of the balls to start vibrating?
Those balls must have been open-cell foam; if they were closed-cell foam, they would have swollen up under vacuum. (Interesting experiment maybe for a guy with a transparent vacuum chamber.)
You said yourself it wasn't "a perfect vacuum".
In reality, there is no such thing. A Vacuum is never zero. There are always some molecules. NDT explains here. ua-cam.com/video/lcYPL3s2Mmw/v-deo.html
You actually had a crude turbo pump there with that fan spinning. If you could have gotten up to, say 30,000 RPM (and provided a passage out) you would have kept pumping. You don't really need a turbo pump, though. You could do this experiment with a diffusion pump and get low enough to stop all bead motion due to air drag.
I've worked in HiVac for decades, and I'm surprised that motor continued to run. Motors overheat very quickly in a vacuum without air to cool them, plus, if that's a brush-type motor, the carbon starts oxidizing with the little air still in there, stopping any current flow.
Would a sprengle pump work?
Mars has winds, but not spaceship tilting wind. Also I'm amazed the motor didn't burn itself out when it no longer had air to cool itself.
How hot was that fan without any air to convectively heat transfer to.
Seems the vibrations caused by the ventilator moves the beads too.
"Right now it's at 3 Volts, which is its operating Voltage"
> Proceeds to increase the Voltage to 14 V.
> Fan breaks.
> Surprised Pikachu face.
This is a very interesting demo! Thanks.
It illustrates why it's difficult to get a helicopter to work on Mars. We'll see that in operation in a few weeks.
It helps that the Martian gravity is only 38 % of Earth's, but it's still a great challenge.
I was literally dreaming about this question and I just woke up to search for an answer, and now here I am!
I think the most surprising part is that the fan motor didn't overheat without any air to conduct away the heat
That's a pretty small fan and in a vacuum there is very little load on the motor.
That was no vacuum, plus there remains lots of air in the styrofoam beads as well...hence the result.
This is what I was thinking too. They’re full of air, and as the vacuum got stronger they outgassed causing all sorts of crazy interactions with the fan, static, pressure, and other beads.
@@BRUXXUS Outgassing very likely increased when the motor speeds began to resemble a blender at the end.
These are absolutely NOT weird results. The beads gained a static charge and the motor had increasing magnetic forces that attracted the charged beads to its rotor, eventually propelling them until they began to bounce each other more and more with increase in voltage.
Ps. Mars has an atmosphere, it's just not oxygenated.
The atmosphere on Mars is also extremely thin and less than 1% of Earth's. It would have taken winds blowing several thousand kph to have the effect shown on "The Martian". The highest wind speeds recorded on Mars are around 160 kph which would be just enough to lift a flag.
the dude who made this video isnt the smartest
I was expecting to see the motor melt. Heat produced by the motor has no atmosphere for cooling. A motor rated at 3 volts driven by 17 volts, probably fried the motor. The only reason I watched this was for the weird results. There were none.
Also mars has a really really thin atmosphere. The strongest winds there are extremely fucking mild
Magnetic forces only exert a force on *moving* charged particles so your hypothesis doesn't work.
Don't for get about Diffusion pumps. Great video, thanks for sharing!
Extra points for mentioning turbo molecular pumps!
4:17 "you can get enough drag on ThOoSe BaLLs"
I was baffled how nobody else caught that until I read this
Reported
No one mentioned the power consumption. When he was sucking air out, the fan got less resistance from the air and you can see the power consumption lowering.
It can also be because as there was no air to drain the heat from motor the wires got hot and resistance increased.
@@ahmedejaz1125 good point, in this case i think both played a role.
fun fact: we are all watching it without full screen
@Tamjid Tahim
I watched in full screen. Time to recalibrate the theorem!
you're wrong! lol
We never use the entire screen.
lol yep
I think the majority of people watch in full screen. Just an opinion🤷♂️
The effects of gravity still plays a major role in this experiment
Cool. You could also slice up a dryer sheet into tiny pieces (about a quarter sheet) and throw it into the box. It would remove all the static. My kids had a dyson toy vacuum with tiny foam balls. Worked like a charm.
Soooo people actually asked if a fan would blow things around with no air????????
Same thought