4B20.20 - Thermal Convection of a Gas - Hot Air Balloon

Code Number:
Demo Title:
Thermal Convection of a Gas - Hot Air Balloon
Thermal Convection
Area of Study:
Heat and Fluids
Hot Air Balloons, Heat Gun.

Set the heat gun on the floor pointing up.  Turn it on and allow it to start blowing very hot air.  Hold the balloon over the gun and fill it with hot air taking care not to ignite the paper with the gun.  Do not cover the intake of the gun in any way.  In about 10 seconds you will feel the balloon start to become buoyant.  When let go the balloon will rise to the roof of the lecture room but will not remain there long because of the heat of the lights and the rapid cooling of the small volume in the balloon.

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