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Ideal vs. Real Gases: Cooling Balloons filled with Helium and Air in Liquid Nitrogen
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A comparison is made of shrinking behavior of balloons cooled in liquid nitrogen. One balloon is filled with air, the other with helium. Also, the change in density of a helium balloon as it warms is observed.
0:10 - Description of how to set up the experiment
0:54 - Balloon filled with air is placed in liquid nitrogen
1:08 - Use of Charles's Law to predict how much the balloon should shrink.
1:56 - Air filled balloon is warmed back to room temperature
2:15 - Explanation that air is not an ideal gas at 77 K
2:58 - Helium filled balloon is placed in liquid nitrogen
3:45 - Liquid nitrogen is poured onto a helium filled balloon
4:07 - Helium filled balloon is warmed to room temperature
5:25 - A large, helium filled balloon is cooled until it no longer floats in air. Then it is warmed, and it slowly begins to rise.
0:10 - Description of how to set up the experiment
0:54 - Balloon filled with air is placed in liquid nitrogen
1:08 - Use of Charles's Law to predict how much the balloon should shrink.
1:56 - Air filled balloon is warmed back to room temperature
2:15 - Explanation that air is not an ideal gas at 77 K
2:58 - Helium filled balloon is placed in liquid nitrogen
3:45 - Liquid nitrogen is poured onto a helium filled balloon
4:07 - Helium filled balloon is warmed to room temperature
5:25 - A large, helium filled balloon is cooled until it no longer floats in air. Then it is warmed, and it slowly begins to rise.
Ideal vs. Real Gases: Cooling Balloons filled with Helium and Air in Liquid Nitrogen
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