Heat (thermal) surface expansion of solid body
$$S_{2} = S_{1}\cdot (1+2\cdot \alpha\cdot \Delta_{t})$$
S_2 - final area
S_1 - initial area
α - temperature coefficient of linear expansion (linear expansivity)
Δ_t - temperature change
S_1 - initial area
α - temperature coefficient of linear expansion (linear expansivity)
Δ_t - temperature change
Find
It is known that:
= 