Question

explain the process of thermal expansion with the help of the molecular theory of matter​

Answer 1

Answer:

Thermal expansion is the tendency of matter to change its shape, area, and volume in response to a change in temperature. Temperature is a monotonic function of the average molecular kinetic energy of a substance. When a substance is heated, the kinetic energy of its molecules increases.

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Answer 2

Answer:

When a substance is heated the average kinetic energy of molecules increases and they start moving with an increased speed.As a result between mean separation between the molecules also increases. thus there is a increase in the length area and volume of the substance.