Question

The density of gold at 20°C is 19,300kg/m3. Find the density at 100°C?

Answer 1

$V=V_0(1+\alpha\Delta T)\to\rho=\rho_0/(1+\alpha\Delta T)\to$

$\rho=19300/(1+42\cdot10^{-6}\cdot(100-20))=19235\ (kg/m^3)$