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Question

Mention the effects of heat on a substance.

Solution
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Following are the effects of heating
1) Expansion:
When heat is added to any substance, the particles gain energy and vibrates(with more speed) or vigorously about their fixed positions, forcing each other further apart.
Order of expansion Gas>Liquid>Solid

2) Increase in temperature:
When heated there is increase in kinetic energy and particles move at higher speed. Since temperature is a measure of average Kinetic Energy, the temperature increases.

3) Change in state:
When there is phase change of solid to liquid and liquid to gas, temperature remains constant but there is absorbing of heat, heat absorbed is used to separate particles and there is no rise in temperature.

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