Kyle Sanchez This is what's called 'projecting'. You always check if your projection is correct before stating it, or you'll look like Kyle, the liberal.
Not necessarily. You just need to measure the change in height from any known reference point. If you start with liquid (water or mercury) in the tube, you can make that the zero and calibrate it whatever pressure you want (1 atm, for example), then measure the height relative to that reference point.
Thanks for this video. I have been suffering to understand this concept but none was working but now this video with the explanation of the barometer and its history with splendid animation have helped not only me but many other students to understand the complexity and art of learning science. Thank you!
Hi Rania I'm pretty sure that you were in your first year in high school and having a trouble with studying physics and barometer when you wrote this comment, the same thing is happening 😂😂💔
As usual, nice one TED! My 3 observations in this video: 1. At 1:34 Gasparo Berti pulled his idea from his arse, literally! Thanks for the funny animation. 2. Both Aristotle and Galileo behaved like jerks with regards to their knowledge of vacuum, albeit being good in other areas. 3. How brilliant both Gasparo Berti and Evangelista Torricelli were, for thinking outside the box (or tube like you mentioned in the video!)
People also had a lot shorter legs back then. Between the Rubenesque women and short-legged men, it''s a wonder the human race has survived. But, enough inane silliness. Really good video. Thanks.
2:59 - I have a question here : If you change the amount of water in the tube will the water still drop to 10.3 m? Amazing video btw, my teacher brought me here and I understood the concept of barometers so much better after watching this :D
Yup it should. For example, if you repeated the experiment but with a 100meter tube, the water pressure in the tube is far greater than the surrounding atmospheric pressure so it would force the water out until the water pressure and atmospheric pressure are equal which would be when there is only 10.3 meters of water left in the tube. Correct me if I'm wrong UA-cam
Yes, it's the weight of the atmosphere that's 'pushing down' on the water and thus 'forcing it up the tube'. So even if you made a tube 1000 meters tall, all the water would spill out until it reaches 10.3m as 10.3m of water equals 1 standard atmospheric pressure. It's also why the mercury barometer is only 0.76 m tall as mercury is much heavier than water. (so 0.76 m mercury = 10.3 m water = 1 atm)
I have a question.....if we put the barometer in a non inertial frame with constant acceleration upawards....will the level of mercury change due to pseudo force??
A vacuum exerts no force. It is the surrounding pressures that pushes the fluid into the tube to collapse the vacuum, and the weight of the fluid that establishes an equilibrium. The classic barometer is therefore a device that uses the weight(and hence pressure exerted by it) of a fluid to measure the opposing surrounding air pressure against it. As proper scientists, we always evaluate how our models would simulate the real world, and not the other way round. The world exists as it is. We merely describe it, not prescribe it. We propose models, then test them. Untested models are merely that, hypothesis, nothing more, but nevertheless, intrinsically valuable.
Worth mentioning that most times bad weather does not cause barometer drop. Small systems bring rain/snow without a drop in atmospheric pressure, actually sometimes the pressure may even increase. Mostly the large systems will cause a pressure drop. In other words., most of the time these barometers are worthless.
Nice video. But there is a small amount of mercury vapor in the space above the mercury, so it's not a perfect vacuum, and it does not prove Aristotle wrong. According to Wikipedia the vapor pressure of mercury at room temperature is about 1Pa.
I totally agree that the thinking outside the box " the tube " is always the right way to find solutions , even if the others do not agree with you THANKS FOR THIS VIDEO 🥰
thanks. must of us have only memorized these concepts taught to us. learning the mechanics behind how and why the concepts were developed bring a deeper understanding of the concepts.
3:33 I don't know if sb wondered about this or not but the reason why increasing the volume of water didn't affect the pressure of the it and it didn't need to go lower in the tube to be in equilibrium with the pressure outside the tube is because pressure of liquids only depends on their *density, height and gravitational field strength*. So since the two tubes are the same height, and the gravitational field strength didn't change and we are using water in both tubes (density of fluid didn't change) it doesn't matter. This may seem like it doesn't make sense but you can google to see the proof of it. And if you still don't understand, it's okay, if I wasn't taking phyiscs this year I wouldn't have understood either 😂😂😂
Very nice! I've a question, at 3:22 , for the height of the mercury column (76 cm), is it measured from the base of the container or from the surface of the mercury in the container?
It's measured from the surface of the mercury. By the way, if you put the tube deeper into the container, the volume of the vacuum would decrease, and vice versa.
Thinking outside the box, I'm glad we have had people like that in the past. We have them today as well, but with so many public trolls around they don't get the chance to even speak.
can anyone answer this question “In what ways does Alexander Calandra’s “The Barometer Story” illustrate the philosophical approach to a practical problem?
The mass of a 1mm square and 760 mm tall column of mercury is the same of a 10287 mm tall water column with the same section area. Is 10,28584 g the heaviest thing you can lift aplying vacuum on a 1 mm x 1 mm area. Is it correct? Since gasoline has 660 grams per liter density, vaccum could lift it 15,584 meters?
what i don't get is, since gases and liquids are both fluids, how can the pressure act on the surface of the liquid, due to its lower density, shouldn't air be able to flow through the liquid which is of higher density and is it not just the air being filled into the barometer tube until the density of air particles inside the column of air inside the tube matches the density of air outside the tube and thus coming into equilibrium? if that is the case it would imply that as altitude increases, the pressure increases and this causes for the volume of air inside the barometer to occupy more space and this totally makes sense when u take into account that if the temperature is highest at the surface of the earth and as we go higher in altitude the temperature decreases(due to distance from the source of heat at the surface of earth) and hence the density of air should also increase.
2:41 instead of a light bulb there is a candle which is historically accurate.
=)))))
😂😂😂
damn didnt realized that
bulls eye.
True!
This is definitely one the best video I've found on barometers. Really nice job on explaining misconceptions about vacuums.
👍🏻
Oh these little scientist dudes are so cute!
No homo?
He feels like he needs a disclaimer whenever he compliments guys. Probably because he's not secure in his own sexuality.
Thank you!
Kyle Sanchez
This is what's called 'projecting'.
You always check if your projection is correct before stating it, or you'll look like Kyle, the liberal.
Kyle Sanchez o
I have to say, the characters in this animation are the cutest I've seen so far. Love it!
"Until necessity raised the issue " : such a deep and wonderful quote ❤️❤️
3:23 The height should be measured from the surface of the liquid
yes!
good eyes sire!
I had that question, thanks for confirming. Ted-ed should at least pin this comment. The graphical designers might not understand this.
Not necessarily. You just need to measure the change in height from any known reference point. If you start with liquid (water or mercury) in the tube, you can make that the zero and calibrate it whatever pressure you want (1 atm, for example), then measure the height relative to that reference point.
thanks, i was wondering
I have experimented this with mug in bath tub (Some Indians can relate)
True
the height of the water level at ground level is close to 9 meters, you can't do it with a mug unless you do it on high terrain.
True lol
not Indian but i can relaten lol
I think that's what we call a faulty barometer or just not a barometer at all
good job with the graphics and explanation....
So weird, I actually have 2 notifications right now.
Pop
Evangelista torricelli
By far the best and simplest explanation I've seen. Good job with the graphics too!
yeah
Thanks for this video. I have been suffering to understand this concept but none was working but now this video with the explanation of the barometer and its history with splendid animation have helped not only me but many other students to understand the complexity and art of learning science. Thank you!
I am from iraq,,,,I like this way to understand information in study,,,,,,great video
Rania Hussein o
@@PhartingFeeting exactly-
Moe J what made you’ll go uncomfortable with it? lol
@@xOxAdnanxOx Chill. They are just pointing out that it is incorrect to use them this way. She should have put dots instead of commas, but.... Mehhh
Hi Rania I'm pretty sure that you were in your first year in high school and having a trouble with studying physics and barometer when you wrote this comment, the same thing is happening 😂😂💔
Loved the way Torricelli had his lightbulb moment with a candle!!
This is my favorite channel so far because of the explanation and animation of each video. They are too good! Thank you Ted-Ed!
Nice way of teaching 😊😊
Good
3:23 the 76 cm height should be measured from the surface of the water.
I’m a little princess 👸
Hi
Bye
Ya... Good observation🤝
True
Totally helpful! I was confused abt the barometer but saw this video and understood everything.. Thank you
So much knowledge we take for granted today were such brilliant discoveries back then
I like the way how you make it easy to understand by making it enjoyable
Use this video every year. Thank you
EXCELLENT video on the background of the barometer, especially the mercury barometer
TED-ED team can you also make a you-tube video on Calculus
Just beginning of it. It would be great
Amazing work team💯
Truly fascinating
This cleared my doubts which arised in the chapter Mechanical properties of fluids thank u
same
So.... what happened after 2007? How do we do it now?
If you aren't aware Aneroid Barometers are now used and will be forever
very good and clearly explained
Lovely explanation
Michaela what is mmhg
I'm so thankful Ted Ed had a video on this, I needed this for my homework and this makes my homework more fun!
As usual, nice one TED! My 3 observations in this video:
1. At 1:34 Gasparo Berti pulled his idea from his arse, literally! Thanks for the funny animation.
2. Both Aristotle and Galileo behaved like jerks with regards to their knowledge of vacuum, albeit being good in other areas.
3. How brilliant both Gasparo Berti and Evangelista Torricelli were, for thinking outside the box (or tube like you mentioned in the video!)
hahah u're right..
People also had a lot shorter legs back then. Between the Rubenesque women and short-legged men, it''s a wonder the human race has survived. But, enough inane silliness. Really good video. Thanks.
CORRECT
Awesome 😊😁😊😁😁😁😁😊😁😊😊😊👍
Good morning. Good night. Good for the video 👍
2:59 - I have a question here : If you change the amount of water in the tube will the water still drop to 10.3 m?
Amazing video btw, my teacher brought me here and I understood the concept of barometers so much better after watching this :D
Yup it should. For example, if you repeated the experiment but with a 100meter tube, the water pressure in the tube is far greater than the surrounding atmospheric pressure so it would force the water out until the water pressure and atmospheric pressure are equal which would be when there is only 10.3 meters of water left in the tube. Correct me if I'm wrong UA-cam
Yes, it's the weight of the atmosphere that's 'pushing down' on the water and thus 'forcing it up the tube'.
So even if you made a tube 1000 meters tall, all the water would spill out until it reaches 10.3m as 10.3m of water equals 1 standard atmospheric pressure.
It's also why the mercury barometer is only 0.76 m tall as mercury is much heavier than water. (so 0.76 m mercury = 10.3 m water = 1 atm)
Ted Ed saves my butt in my chem honors class every unit.
Thank you so much
fantastic way to learn
I have a question.....if we put the barometer in a non inertial frame with constant acceleration upawards....will the level of mercury change due to pseudo force??
I'm from iraq , this way of learning is amazing 💗
رابع علمي؟
@@DivineAgility اي
@@twitwilight6087 عاش اني هم
@@DivineAgility الفيزيا ضيم مو ؟
nice to understand easily
A vacuum exerts no force. It is the surrounding pressures that pushes the fluid into the tube to collapse the vacuum, and the weight of the fluid that establishes an equilibrium.
The classic barometer is therefore a device that uses the weight(and hence pressure exerted by it) of a fluid to measure the opposing surrounding air pressure against it.
As proper scientists, we always evaluate how our models would simulate the real world, and not the other way round. The world exists as it is. We merely describe it, not prescribe it.
We propose models, then test them. Untested models are merely that, hypothesis, nothing more, but nevertheless, intrinsically valuable.
Worth mentioning that most times bad weather does not cause barometer drop. Small systems bring rain/snow without a drop in atmospheric pressure, actually sometimes the pressure may even increase. Mostly the large systems will cause a pressure drop. In other words., most of the time these barometers are worthless.
There is a mistake at (or near) the 3:22) mark in the video. The dimension should be from the top of the pool of mercury, not the bottom.
I can't understand the experiment until this. Thanks =)))
Great video, helped me understand the topic really well
"Fortunately, he turned out to be wrong"
A phrase commonly heard when Aristotle is brought up
Great explanation 🎉🎉🎉
I'm watching this video because my new digital watch has a Barometer App.
Knowledge is power.
this helped so much
the other TED videos are not so ..They are very well.
I understood the concept of barometer bec of your video. THANKS
Nice video. But there is a small amount of mercury vapor in the space above the mercury, so it's not a perfect vacuum, and it does not prove Aristotle wrong. According to Wikipedia the vapor pressure of mercury at room temperature is about 1Pa.
Pete Gravell i don't think that there is a mercury vapor in all cases
Pete Gravell
Aristotle was wrong in atomic scale as well...
Thanks dude u cleared my doubts
it was fun and learned easily
its so so so lively and understandable
pls try your luck in many more topics
thanks sir!! very useful actually
I totally agree that the thinking outside the box " the tube " is always the right way to find solutions , even if the others do not agree with you
THANKS FOR THIS VIDEO 🥰
el vídeo que necesitaba ver, muchas gracias
Thanks bro...... before i see this video, i have no idea about this exeriment.
This helped me a lot... Thank you soo much
Beautiful explanation!
Very good explanation, tyvm.
thanks. must of us have only memorized these concepts taught to us. learning the mechanics behind how and why the concepts were developed bring a deeper understanding of the concepts.
This really helps a lot and well-explained compared in schools
Its very helpful.😊
Great explaination
Great story!
It was Best explanation...
Thankyou
3:33 I don't know if sb wondered about this or not but the reason why increasing the volume of water didn't affect the pressure of the it and it didn't need to go lower in the tube to be in equilibrium with the pressure outside the tube is because pressure of liquids only depends on their *density, height and gravitational field strength*.
So since the two tubes are the same height, and the gravitational field strength didn't change and we are using water in both tubes (density of fluid didn't change) it doesn't matter. This may seem like it doesn't make sense but you can google to see the proof of it.
And if you still don't understand, it's okay, if I wasn't taking phyiscs this year I wouldn't have understood either 😂😂😂
not avacuum there is vapour pressure there but in minimum value so can be neglected without much error
@Rocket Man on Suicidal Mission Yep there are only partial vacuums with very few particles per unit volume
one question, does the existence od the vacum creates a succion on the water?
ted ed is the best!
I love stories about challenging pre-existing theory and making major scientific breakthrough!!
Very nice!
I've a question, at 3:22 , for the height of the mercury column (76 cm), is it measured from the base of the container or from the surface of the mercury in the container?
It's measured from the surface of the mercury. By the way, if you put the tube deeper into the container, the volume of the vacuum would decrease, and vice versa.
Extremely helpful
Nice and descriptive explanation.Well done.
Well made, and such nice animations ^-^
Thank you Philipp!
These are on planes for decision height altitude for anp/rnp landings in low visibility around mountainous areas
Beautiful execution👏
Good job
thank you.. very nice exlanation
Thinking outside the box, I'm glad we have had people like that in the past. We have them today as well, but with so many public trolls around they don't get the chance to even speak.
This is awesome and so adorable, thank you :D
Amazing 😍😍😍
I really enjoy Toricelli and his result.
This is a great video! thanks for the information!
always such a wholesome videos✨
Awesome animation and explanation
Thanku so much this is really helpful🤗
HOW INTERESTING! THANK YOU
Legends are watching in 2021 !
can anyone answer this question
“In what ways does Alexander Calandra’s “The Barometer Story” illustrate the philosophical approach to a practical problem?
This vacuum is the void of matter but it is filled with a liquid more mysterious than anything mankind has ever tried to understand.
Thank you for the video
How does having a column of water higher then its surrounding go hand in hand with the connected vessels principle?
Communicating vessels*
@@TomWinkler-mz9yp The communicating vessels are open to the atmosphere on both sides.
Nice work
Thank you sir
The mass of a 1mm square and 760 mm tall column of mercury is the same of a 10287 mm tall water column with the same section area. Is 10,28584 g the heaviest thing you can lift aplying vacuum on a 1 mm x 1 mm area. Is it correct? Since gasoline has 660 grams per liter density, vaccum could lift it 15,584 meters?
That was really good !!
Great video. What is your reference?
what i don't get is, since gases and liquids are both fluids, how can the pressure act on the surface of the liquid, due to its lower density, shouldn't air be able to flow through the liquid which is of higher density and is it not just the air being filled into the barometer tube until the density of air particles inside the column of air inside the tube matches the density of air outside the tube and thus coming into equilibrium? if that is the case it would imply that as altitude increases, the pressure increases and this causes for the volume of air inside the barometer to occupy more space and this totally makes sense when u take into account that if the temperature is highest at the surface of the earth and as we go higher in altitude the temperature decreases(due to distance from the source of heat at the surface of earth) and hence the density of air should also increase.
Such a great video. Thank you.
Thank you !!
Thanks TED...nice explanation ever