Selected Densities sorted by Material Density Category Material Density (g/cc) -------- --------------- -------------- Wood Walnut 0.593 Chemical Gasoline 0.721 Other Paper 0.929 Plastic HDPE 0.955 Liquid Water, 100 °C 0.9581 Liquid Water, 4 °C 0.99997 Liquid Seawater 1.025 Ceramic Glass 2.6 Metal Aluminum 2.643 Metal Pig Iron 7.207 Metal Pure Iron 7.86 Metal Stainless Steel, 304 8.03 Metal Brass 8.553 Metal German Silver 8.586 Metal Copper, cast-rolled 8.906 Metal Silver, Pure 10.5 Metal Lead 11.37 Metal Mercury 13.57 Metal Uranium 18.74 Metal Gold, Pure 19.32 Metal Plutonium, alpha phase 19.35