Question

Investigate the processes making use of thermal expansion of substances.

Answer 1

Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature. ... When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin vibrating/moving more and usually maintain a greater average separation.

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Answer 2

Thermal expansion is the tendency of matter to change in shape, area, and volume in response to a change in temperature. ... When a substance is heated, the kinetic energy of its molecules increases. Thus, the molecules begin vibrating/moving more and usually maintain a greater average separation.