I3-33 HELIUM BALLOON ON LIQUID NITROGEN
- ID Code: I3-33
- Purpose: Demonstrates how a gas contracts when cooled
- Description: A helium balloon which is cooled by resting on a liquid nitrogen bath becomes becomes more dense -- by about a factor of 4. When the balloon is removed from the liquid nitrogen it warms up, expands, and floats away, unless it is tethered
- Availability: Available
- Loc codes: I0, FS1