Question

Why do gases expands more than solids for the same increase in temperature?

Answer 1

Answer:

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.

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.

Answer 2

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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. However, gases that are contained in a fixed volume cannot expand - and so increases in temperature result in increases in pressure.

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