Egg in a Flask – Thermal Decrease in Molar Volume
Description: A hard boiled egg is placed on the opening of a flask, and the flask placed in liquid nitrogen. The decrease in pressure inside the flask pushes the egg into the neck of a flask.
Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry
Year: 1985 Vol: 2 Page: 24
Keywords: Egg in flask, Volume, Temperature, Pressure
Rating: 
Hazard: Medium
- Cryogenic burn hazard
- Breakage hazard
- Asphyxiation hazard
Effectiveness: Good
- Strong effects seen by audience
- Time to results is low
- Clearly observable without guidance
- Good connection from demo to course material
- Medium reliability
- Clear contrast between behavior of systems
Difficulty: Medium
- Demos at non-standard conditions
- Simple procedures
- Precise manipulation is required
Safety Precautions:
- Eye protection required
- Perform in a well-ventilated area
- Thermal gloves required
Class: Gas Laws
Division: General
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