Question

Give two important effects of heat.

Answer 1

Following are the effects of heating:

1. Expansion:

1. When heat is added to any substance, the particles gain energy and vibrate (with more speed) vigorously about their fixed positions, forcing each other further apart.
2. Order of expansion Gas>Liquid>Solid2)

2. When heat is supplied to a body its temperature rises:

1. When a material body, solid, liquid, or gas, is given heat energy, its temperature increases.
2. When this hot body gives out heat energy its temperature decreases.

3. Change in the state:

1. When there is a phase change of solid to liquid and liquid to gas, the temperature remains constant but there is the absorption of heat, heat absorbed is used to separate particles and there is no rise in temperature.