Material Needed
A bottle, a balloon and any source of heat.
Procedure 1) Place the balloon on the bottle so that air does not pass.
2) Take the hair dryer (or any source of heat) and heat the bottle.
Conclusion The volume of air varies depending on temperature:
if the bottle cools down the volume air decreases.
If the bottle is heated the volume increases, and then the balloon is inflated
Text and photos by Renato Taccogna
