Boyle’s Law and the Mass of a Textbook
Effect of Pressure on the Size of a Balloon
Egg in a Flask – Thermal Decrease in Molar Volume
Flow of Gases Through a Porous Cup
Rate of Diffusion: The Ammonia Chloride Ring
Boltzmann: Digital Simulation of Kinetic Molecular Theory
Boyle’s Law and the Monster Marshmallow
PhET Simulation of Gas Behavior
Effect of Pressure Differences on a Balloon In a Flask
Extinguishing Candles with Carbon Dioxide
A Metal Bar to Demonstrate One Atmosphere
Relation of Gas Pressure and Temperature
Transport of Carbon Dioxide Through a Soap Film
Digital Molecular Theory Simulator
Boyle’s Law and the Monster Marshmallow
Description: Place a marshmallow inside a bell-jar, and evacuate it. The marshmallow swells as the external pressure is reduced.
Source: Journal of Chemical Education Vol. 59
Year: 1982 Vol: 59 Page: 974
Keywords: Boyle’s Law, Marshmallow, Pressure, Bell jar, Vacuum
Rating: 
Hazard: Some
- Implosion hazard
- Electric shock hazard
- Rotating machinery in use
Effectiveness: Good
- Results are clearly observable without guidance
- Time to results is medium
- Clear contrast between behavior of systems
- Good connection from demo to course material
- Moderate failure rate – fresh marshmallow required for performance
Difficulty: Medium
- Some concerted or timed manipulations
- Demos at non-standard conditions
- Manipulation of large glassware
- Some sequential steps to results
Safety Precautions:
- Eye protection required
- Use of UL approved three-prong plug and outlet
- Lab coat recommended
- Handle large glassware with care
Class: Gas Laws
Division: General
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