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 ${\displaystyle \left(\frac{\Delta \text{A}}{{\text{A}}_0}\right)}$ of a substance is directly proportional to ∆T and it can be written as

${\displaystyle \frac{\Delta \text{A}}{{\text{A}}_0}={\alpha }_{\text{A}}\Delta \text{T}}$

Therefore, ${\displaystyle {\alpha }_{\text{A}}=\frac{\Delta \text{A}}{{\text{A}}_0\Delta \text{T}}}$