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Project
Fix a balloon over the neck of a bottle and put the bottle in hot water. Explore what will happen?
Show sample answer
Key Points
The balloon inflates as the warm air expands.
Key Points / Good Practices
- Hot water warms the air inside the bottle.
- On heating, the air particles gain energy and move faster.
- They spread out and need more space.
- The expanding air pushes into the balloon and inflates it.
- Try cool water too and compare what happens.
- Handle the hot water carefully with an adult's help.
Heating makes gas particles spread out, so the warm air inflates the balloon.
