Question

Explain why solids expand when its heated

Answer 1

Answer:

All three states of matter (solid, liquid and gas) expand when heated. The atoms themselves do not expand, but the volumethey take up does.

When a solid is heated, its atoms vibrate faster about their fixed points. The relative increase in the size of solids when heated is therefore small. Metal railway tracks have small gaps so that when the sun heats them, the tracks expand into these gaps and don’t buckle.