Question

Write different types of expansion cause by heat.

Answer 1

When heat is added to a solid, the particles gain energy and vibrate more vigorously about their fixed

positions, forcing each other further apart. As a result expansion takes place. Similarly, the particles in

a liquid or gas gain energy and are forced further apart. The degree of expansion depends on the

substance.

For a given rise in temperature a liquid will expand more than a solid. Gases expand enormously on

heating, causing a possible explosion if the gas is in a confined space.

In a fire, the thermal expansion of steel beams, concrete and glass can cause considerable damage,

especially if expansion takes place at different rates, setting up stresses in the material or structure.

Liquids in drums and pans may overflow when heated. This is due to the fact that liquids expand at a

greater rate than solids.