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 Ammonium 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
Effect of Pressure on the Size of A Balloon
Description: A small sealed balloon is placed in a bell jar connected to a vacuum pump. As the flask is evacuated, the balloon increases in size.
Source: Shakhashiri, B.Z. Chemical Demonstrations: A Handbook for Teachers of Chemistry
Year: 1985 Vol: 2 Page: 12
Keywords: Balloon in a flask, Air pressure, Aspirator
Rating: 
Hazard: Some
- Implosion hazard
- Electrical shock hazard
- Breakage hazard
Effectiveness: Good
- Results are clearly observable without guidance
- Strong effects are seen by audience
- High reliability
- Time to results are low
Difficulty: Medium
- Reaction at non-standard conditions
- Tight seal is needed for bell jar
- Large fragile glassware
- Some timed and concerted manipulations
- Simple procedures
Safety Precautions:
- Eye protection required
- Use of UL three-prong grounded plug and outlet
- Handle glassware with care
Class: Physical Chemistry, Gas Laws
Division: General
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