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4C30.30 - Helium, CO2, and Argon Balloons in Liquid N2
Code Number: 4C30.30
Demo Title: Helium, CO2, and Argon Balloons in Liquid N2
Condition: Excellent
Principle: Phase Changes
Area of Study: Thermodynamics
Procedure:
Fill balloons with the desired gas. Place into the container of liquid nitrogen until they have collaped to a smaller volume. Bring them out of the container and allow them to re-expand. Note that there will be some liquid in the cooled balloons depending on the gas. A cage over the helium balloon will keep it from escaping.
References:
- John Hendricks, Denny Lee, Mac Rugheimer, "Liquid Nitrogen Demonstration, AJP, Vol. 39, #7, July 1971, p. 844.