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In this exercise, an activity is explained to understand how expansion and contraction happen.
Materials required:
Big bottle, balloon, threads, candle, water and fork
Procedure:
- Take one big bottle, and fill some water in it.
- Attach one balloon to the mouth of the bottle and fix it with thread.
- Hold the bottle with a fork. Heat the bottle with a candle and take an observation.
What change occurs in the state of the balloon after heating the bottle?
When the bottle is heated, the air molecules inside start . These molecules now collide into the balloon with resulting in . This molecular collision results in the air inside the balloon getting heated and . This causes the balloon to .
- Now, let the bottle get cooled down.
What change occurs in the state of the balloon after the bottle cools down?
The temperature within the bottle reduces, causing the air to cool down. This reduction in temperature causes the balloon to .
Why does a tyre get burst in summer?
During summer, the air inside the tyre of a vehicle will get with the of the air inside the tyre. As there is tyre will get bursted.
Result to understand:
When the substance (solid, liquid or gas) gets heated, it ; when it cools down, it .
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