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