Question

Explain why a substance ‘expands’ on heating.

Answer 1

When substances expand or contract, their particles stay the same size. It is the space between the particles that changes: the particles in a solid vibrate more when it is heated, and take up more room. the particles in a liquid move around each other more when it is heated, and take up more room.

Answer 2

Answer:

Due to incease in temperature of a substance