Question

Give the expression for area thermal expansion.

Answer 1

Area Expansion: For a small change in temperature ∆T the fractional change in the area `((Δ"A")/("A"_0))` of a substance is directly proportional to ∆T and it can be written as

`(Δ"A")/("A"_0) = α_"A"Δ"T"`

Therefore, `α_"A" = (Δ"A")/("A"_0Δ"T")`