Explain some common effects of heat with examples.
Answers
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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Answer:
The effects of heat energy are the following: ... (iv) On heating, change of state may occur, i.e. a solid may change into a liquid and a liquid may change into a gas. For example if ice (solid) is heated it changes its state to water (liquid) and if this water is further heated it becomes water vapour (gas).