Densities of materials

metal g/cm^3 lb/in^3 lb/ft^3   lb/gal 
water 1.00  0.036  62 8.35 
aluminum 2.70 0.098 169 22.53
zinc 7.13 0.258 445 59.50
iron 7.87 0.284 491 65.68
copper 8.96 0.324 559 74.78
silver 10.49 0.379 655 87.54
lead 11.36 0.410 709 94.80
mercury 13.55 0.490 846 113.08
gold 19.32 0.698 1206 161.23