Coefficient of cubical expansion of a metal cube is 'γ'  increase in temperature  for which the volume of the cube increases by 5% is  xγ where  x=

final volume V2=V+5100V V is initial volume                   V2=105100VV2=1.05V          ;  here  V1=V = initial volume coefficient of cubicl expansion γ=V2-V1V1ΔT ⇒V2=V11+γΔT 1.05v=v1+γΔT 0.05=γΔT ΔT=0.05γ x=0.05