Question

Why does a body expand when it is heated? State
and explain any two applications of thermal expansion.​

Answer 1

All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volume they take up does. ... Heat causes the molecules to move faster, (heat energy is converted to kinetic energy ) which means that the volume of a gas increases more than the volume of a solid or liquid.

Answer 2

It start expand when it is heated because the molecules start expanding , they start to get away from each other .

1 thermometer

2 engine coolant