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प्रश्न
Give the expression for area thermal expansion.
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उत्तर
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")`
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