Here's a Question! - Steam Filled Can in Ice Water
Вставка
- Опубліковано 5 бер 2023
- A little bit of water is poured into an aluminum soda can. The can is placed on a heater and the water is brought to a boil. The can is picked up, turned upside down, and then slowly lowered into a bath of ice water. What happens to the can?
Full Playlist: • Here's a Question!
All "Here's a Question!" videos:
A Basketball Rolls Off a Table - • Here's a Question! - A...
A Boat on Water - • Here's a Question! - A...
Big Balloon, Small Balloon - • Here's a Question! - B...
Boat and Anchor (Part 1) - • Here's a Question! - B...
Boat and Anchor (Part 2) - • Here's a Question! - B...
Boat and Anchor (Part 3) - • Here's a Question! - B...
Boat and Anchor (Part 4) - • Here's a Question! - B...
Bubble in a Bowl - • Here's a Question! - B...
Can it Roll? - • Here's a Question! - C...
Circle vs. Triangle - • Here's a Question! - C...
Coins on a Hoop - • Here's a Question! - C...
Cut a Magnet - • Here's a Question! - C...
Dictionary vs. Styrofoam Cup - • Here's a Question! - D...
Finger in a Cup - • Here's a Question! - F...
Food Coloring and Liquid Nitrogen - • Here's a Question! - F...
Gas on a Flame - • Here's a Question! - G...
Ice in a Glass - • Here's a Question! - I...
Image from a Pinhole Camera - • Here's a Question! - I...
Image from Half a Pinhole - • Here's a Question! - I...
The Magnet Powered Car - • Here's a Question! - T...
Magnetism and Fire - • Here's a Question! - M...
Make a Magnet? - • Here's a Question! - M...
Mass of Burning Paper - • Here's a Question! - M...
Mass of Burning Steel Wool - • Here's a Question! - M...
Masses on a String (Fast Pull) - • Here's a Question! - M...
Masses on a String (Slow Pull) - • Here's a Question! - M...
Scales and Static - • Here's a Question! - S...
Scales in Parallel - • Here's a Question! - S...
Scales in Series - • Here's a Question! - S...
Small Pinhole vs. Large Pinhole - • Here's a Question! - S...
Soaker vs. Jet - • Here's a Question! - S...
Steam Filled Can in Ice Water - • Here's a Question! - S...
Swinging Pendulums (Different Angles) - • Here's a Question! - S...
Swinging Pendulums (Different Masses) - • Here's a Question! - S...
Water from a Spiraled Hose - • Here's a Question! - W...
Wet or Dry? - • Here's a Question! - W...
What Shape Does the Sun Trace? - • Here's a Question! - W...
Which Hits the Floor First? - • Here's a Question! - W...
Which is Hotter? - • Here's a Question! - W...
Which Melts First? - • Here's a Question! - W...
Which Pops First? - • Here's a Question! - W...
Why Does the Water Rise? - • Here's a Question! - W...
#implosion #airpressure #gaslaws #idealgaslaw #heresaquestion
I've been getting lucky with my guesses, but haven't been able to explain why. Thanks for the great exposition!
The can gave it its best, but oh my, what a crushing defeat.
:D
Ah, as the old adage goes, nature abhors a vacuum.
Thanks guys.
What surprised me was the speed of it! Impressive. Thank you.
And I've always seen this done where the person is in a huge hurry to get the can into the water. It's like they slam it in and, visually, it makes it hard to tell if the can is imploding, being crushed by the tongs, or being crushed due to it running into the water. So, we took our time to better show what it does.
This is the first one I knew from actually doing the experiment as a kid many moons ago.
water is amazing
I remember seeing this done with steel drums. It's impressive.
BTW I think of y'all and your videos often as every couple weeks or so I drive past the exit for Jefferson Labs.
Good lesson in thermodynamics.
The subsequent question is: if the pressure in the can was less than atmospheric pressure, why didn't the can just draw up water from below to equalize the pressure?
Does this have something to do with the strength of the pressure vessel or maybe the size of the passage. Can you do more investigation and demonstrations of these variables?
But wouldn't it draw up the water only if the pressure difference was caused by difference in velocities? Here the water is simply vibrating at a molecular level. So, the pressure difference must be caused due to different temperatures. But the video says - when the water turns from gas to liquid, there is a pressure drop. This confuses me.
@Shristeerupa It sounds like you're thinking of the Bernoulli principle, where changing the speed of flow of a fluid in something like a pipe changes its pressure. Here, the can is effectively like a straw. The water should (and does) flow up into it because the atmospheric pressure inside the can is lower than the atmospheric pressure outside the can.
When a gas is cooled, its pressure drops because the particles that make up the gas slow down. They hit the walls of the container less frequently, and with less speed, so there's less pressure. However, with this, the 'atmosphere' in the can is largely water vapor. When it is cooled to a liquid, the particles are no longer running around colliding with the walls of the can because they changed into a puddle of liquid. They no longer contribute to the gas pressure because they are no longer a gas. You end up with very few particles hitting the inside walls of the can. It's not nearly enough to balance what the atmosphere is doing to the outside of the can.
@@11oreos The pressure drop is the result of a change of state from a gas to a liquid. Initially there is mostly steam (gas) inside the can. Lowering the temperature of the steam causes it to condense (turn into a liquid), so the volume has to decrease placing the inside of the can in a slight vacuum. The soda can is designed to withstand positive pressure but is extremely weak in negative pressure conditions. Negative meaning, less than atmospheric pressure. These are the same principles upon which a typical steam engine works only in reverse.
@David Morse Actually, water is drawn into the can. You can see this when the can is removed from the ice bath - water comes out. That's the water that was drawn into the can. You can also see, indirectly, by the opening of mouth of the can. It's a bit hard to see, but you may be able to tell that the 'flap' is mostly covering the opening at the beginning. You can kind of see it warping up a bit while the can is sitting on the heater. When it's removed from the ice bath, the opening is mostly clear. The water pushed the flap out of the way as it forced its way into the can.
So, why didn't this prevent the collapse? Basically, it's inertia's fault. The water simply get into the can quickly enough.
There's also a third way to 'see' that water is moving into the can. That downward jerk the can makes as it collapses? The one that causes the tongs to be drawn downwards? That isn't the experimenter doing that. That's an action-reaction effect. Sort of a water powered bottle rocket in reverse. The water is being thrown 'forward' into the can, so the can reacts by being thrown 'backward'.
@@JeffersonLab Thank you for the explanation. That makes sense. I am amazed at how fast the change takes place. I also wonder what would happen if the top of the can was totally opened up. Probably still collapse because of the inertia of the water in liquid form. Like you said, inertia plays a definite part.
I think maybe the cold water being drawn up into the can might be what makes the reaction take place so fast as there would be cold liquid coming into direct contact with steam.
Why are you working so late at might?
Science never sleeps.
@@JeffersonLab But if you don't have enough sleep, science will work on you and you'll have sleep deprivation.
It's a risk we take.
All great thinkers have trouble sleeping. It's a curse. Also explains why I can sleep so well. It's probably the one thing that I can do well.
c
I don't think you understand what a question is.