Question

what si thermal expansion?​

Answer 1

Answer:

Thermal expansion is the tendency of matter to change its shape, area, volume, and density in response to a change in temperature, usually not including phase transitions. Temperature is a monotonic function of the average molecular kinetic energy of a substance.

Answer 2

Answer:

Thermal expansion is the tendency of matter to change in shape, volume, and area in response to a change in temperature. ... The degree of expansion divided by the change in temperature is called the material's coefficient of thermal expansion