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I3-33. Helium Balloon On Liquid Nitrogen

Purpose

To show that helium gas contracts when it is cooled.

Equipment

Helium balloon, liquid nitrogen.

Images

I3-33

Description

A helium balloon which is cooled by a liquid nitrogen bath becomes heavier than air. When the balloon is removed from the liquid nitrogen it warms up, expands, and floats away.

I. Thermodynamics

I. Thermodynamics

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