Question

What is meant by thermal expression of a body? What are the different types of thermal expression?Explain. ​

Answer 1

What is meant by thermal expansion of a body?

expansion, in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between the molecules composing it are increased and, hence, the space occupied by the body, i.e., its volume, increases.

What are the different types of thermal expression?

Thermal expansion is the phenomenon in which the matter has the propensity to change in its size, shape, area or volume when the temperature of the matter increases on passing heat energy through it. There three types of thermal expansion: Linear thermal expansion. Areal thermal expansion.