Density is given as
[tex]\rho = 5.23 * 10^{-6} kg/mm^3[/tex]
now we have to convert this density into [tex]kg/m^3[/tex]
now we have
[tex] 1 m = 1000 mm[/tex]
[tex]\rho = 5.23 * 10^{-6} \frac{kg}{(1*10^-3 m)^3}[/tex]
[tex]\rho = 5.23 * 10^{-6} \frac{1*10^9 kg}{m^3}[/tex]
[tex]\rho = 5.23 * 10^3 kg/m^3[/tex]
[tex]\rho = 5230 kg/m^3[/tex]