Question

write an activity to show that matter expands on heating​

Answer 1

Answer:

Take a bottle. Tie the balloon tightly on the neck of the bottle. ... This happens because when the bottle is placed in hot water, the air in it becomes warm and expands due to which balloon also expands. When the bottle is placed in cold water, the air in the bottle contracts due to which balloon also contracts.

Answer 2

$\huge\mathfrak\red{Answer :) }$

Air expands on heating. Why does this happen? It is because the particles of air on becoming warm, move away from each other and take up more space. So we can say that air on becoming hot occupies more space. Since the particles move away from each other, the air becomes less dense and lighter in weight.