Metal density (g/cm^3) ---------------------------------- aluminum 2.73 brass 8.50 chromium 7.19 copper 8.94 gold 19.3 iron 7.85 lead 11.3 magnesium 1.74 mercury 13.6 nickel 8.90 platinum 21.4 silver 10.5 sodium 0.97 steel 7.85 tin 7.28 zinc 7.14