Linear expansivity (α)
= A2−A1A1θ
Original Area(A1) = 4 x 3 = 12
New Area (A2) = ?
Temp. rise (θ) = 100oC
A2 - 12 = 1200 x 2 x 1.2 x 10−5
A2 - 12 = 2880 x 10−5
A2 - 12 = 0.0288
A2 = 12.0288 cm2
