Question

formula of expansion​

Answer 1

delta L is the change in length of the bar, delta T is the change in temperature of the bar, L is the original length before the temperature changed, and alpha is the linear coefficient of thermal expansion. The coefficient is just a number that represents how much the material expands.

Answer 2

HEY MATE HERE IS YOUR ANSWER

∆L/L=@∆T

∆A/A=B∆T

∆V/V=G∆T