Find the ratio of densities of lead at 100 degree centigrade and -100 degree centigrade , if the average co-efficient of volume expansion of lead is 8.4x10-5 per degree centigrade ?

V100=V01+γ×T    =V01+8×10-5×100=1.008V0V100=1.008V0----1And      V-100 =V01-8×10-5×100or       V-100=0.992V0------2The dendity is inversely proportional to the volumei. e.      ρt α 1VtSo     ρ100 ρ-100=V-100V100So dividing eqn 2 by eqn 1, we get                     ρ100 ρ-100= V-100V100=0.992V01.008V0=0.984

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