Freezing Balloons
Description: The behavior of balloons is compared when they are filled with helium and carbon dioxide and cooled in liquid nitrogen.
Source: Chem13 News #204: May
homepage: https://uwaterloo.ca/chem13-news-magazine/
Year: 1991 Vol: 23 Page: 2
Keywords: Change of state, Sublimation, Condensation, Cryogenics
Rating: 
Hazard: Some
- Cryogenic burn hazard
- Asphyxiation hazard
- Implosion hazard
Effectiveness: Good
- Strong effects seen by audience
- Good connection to course material
- Low failure rate
- Clear contrast between behavior of systems
- Time to results is low
Difficulty: Low
- Simple procedures
- Manipulations are simple for most to perform
Safety Precautions:
- Cryogenic gloves are required
- Eye protection is required
- Perform in a well-ventilated area
- Use of tongs is recommended
- Latex allergen
Class: Phase Changes, Physical Chemistry, Gases, Liquid and Solids
Division: General
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