Coef. of Superficial Expansion of Solids
1.

The coefficient of cubical expansion of a metal is 7.2 × 10–5  °C –1. Find its

(i) coefficient of linear expansion,
(ii) coefficient of superficial expansion?

Sol:
Coefficient of linear expansion, α = 1/3 × γ
= 1/3 × 7.2 × 10–5
= 2.4 × 10–5°C–1
Coefficient of superficial expansion, β = 2/3 × γ
= 2/3 × 7.2 × 10–5
= 4.8 × 10–5°C–1