Question

Define three coefficients of thermal expansion

Answer 1

The coefficient of thermal expansion is used:

in linear thermal expansion
in area thermal expansion
in volumetric thermal expansion
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Answer 2

Basically there are coefficients of thermal expansion...
1) Linear expansion. ..this expansion is about the length or one dimension of the body....denoted by Alpha..

2) Areal or Superficial expansion.....this expansion is about the area of the body....denoted by Beta

3) Volumic expansion .....this expansion is about the volume of the body...denoted by Gamma...