23 Hydrogen gas Main 14.3 28.82 22 Helium gas Main 5.193 20.786 12.471 4 Ammonia liquid Main 4.7 80.08 3.26 3.21 29 Lithium at 181 °C liquid Main 4.379 30.33 2.242 3.65 28 Lithium at 181 °C solid(?) Main 4.233 50 Water at 100 °C liquid Main 4.216 75.95 67.9 3.77 49 Water at 25 °C liquid Main 4.181 75.34 74.55 4.138 65 Water liquid Building materials 4.181 27 Lithium solid Main 3.58 24.8 1.912 2.98 5 Animal tissue (incl. human) mixed Main 3.5 3.7 38 Paraffin wax C₂₅H₅₂ solid Main 2.5 900 2.325 16 Ethanol liquid Main 2.44 112 1.925 39 Polyethylene (rotomolding grade) solid Main 2.302 2.15 17 Gasoline (octane) liquid Main 2.22 228 1.64 32 Methane at 2 °C gas Main 2.191 35.69 33 Methanol liquid Main 2.14 68.62 1.695 51 Water at −10 °C (ice) solid Main 2.05 38.09 1.938 48 Water at 100 °C (steam) gas Main 2.03 36.5 27.5 1.53 9 Beryllium solid Main 1.82 16.4 3.367 1.97 66 Wood solid Building materials 1.7 34 Molten salt (142–540 °C) liquid Main 1.56 2.62 42 Sodium solid Main 1.23 28.23 1.19 3.39 61 Gypsum solid Building materials 1.09 35 Nitrogen gas Main 1.04 29.12 20.8 36 Neon gas Main 1.03 20.786 12.471 30 Magnesium solid Main 1.02 24.9 1.773 2.99 24 Hydrogen sulfide H₂S gas Main 1.015 34.6 2 Air (typical room conditions) gas Main 1.012 29.19 20.85 0.00121 1 Air (Sea level, dry, 0 °C (273.15 K)) gas Main 1.0035 29.07 20.764 0.001297 53 Asphalt solid Building materials 0.92 37 Oxygen gas Main 0.918 29.38 21 3 Aluminium solid Main 0.897 24.2 2.422 2.91 55 Concrete solid Building materials 0.88 62 Marble, mica solid Building materials 0.88 18 Glass solid Main 0.84 2.1 54 Brick solid Building materials 0.84 56 Glass, silica liquid Building materials 0.84 12 Carbon dioxide CO₂ gas Main 0.839 36.94 28.46 63 Sand solid Building materials 0.835 64 Soil solid Building materials 0.8 20 Granite solid Main 0.79 2.17 60 Granite solid Building materials 0.79 59 Glass, borosilicate liquid Building materials 0.753 21 Graphite solid Main 0.71 8.53 1.534 1.03 40 Silica (fused) solid Main 0.703 42.2 1.547 57 Glass, crown liquid Building materials 0.67 45 Titanium solid Main 0.523 26.06 2.638 3.13 7 Argon gas Main 0.5203 20.786 12.471 15 Diamond solid Main 0.509 6.115 1.782 0.74 58 Glass, flint liquid Building materials 0.503 43 Steel solid Main 0.466 3.756 13 Chromium solid Main 0.449 23.35 3.21 2.81 25 Iron solid Main 0.449 25.09 3.537 3.02 52 Zinc solid Main 0.387 25.2 2.76 3.03 14 Copper solid Main 0.385 24.47 3.45 2.94 8 Arsenic solid Main 0.328 24.6 1.878 2.96 41 Silver solid Main 0.233 24.9 2.44 2.99 11 Cadmium solid Main 0.231 26.02 2 3.13 44 Tin solid Main 0.227 27.112 1.659 3.26 6 Antimony solid Main 0.207 25.2 1.386 3.03 31 Mercury liquid Main 0.1395 27.98 1.888 3.36 46 Tungsten solid Main 0.134 24.8 2.58 2.98 19 Gold solid Main 0.129 25.42 2.492 3.05 26 Lead solid Main 0.129 26.4 1.44 3.18 10 Bismuth solid Main 0.123 25.7 1.2 3.09 47 Uranium solid Main 0.116 27.7 2.216 3.33