Question

why do most substance expand on heating​

Answer 1

Substance Expand on Heating. When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. ... The end result of increased molecular motion is that the object expands and takes up more space.

Answer 2

Answer:

Molecules within gases are further apart and weakly attracted to each other. 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.