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[11] [12] Uranium metal has a very high density of 19.1 g/cm 3, [13] denser than lead (11.3 g/cm 3), [14] but slightly less dense than tungsten and gold (19.3 g/cm 3). [15] [16] Uranium metal reacts with almost all non-metallic elements (except noble gases) and their compounds, with reactivity increasing with temperature. [17]
— "Values ranging from 21.3 to 21.5 gm/cm 3 at 20 °C have been reported for the density of annealed platinum; the best value being about 21.45 gm/cm 3 at 20 °C." 21.46 g/cm 3 — Rose, T. Kirke. The Precious Metals, Comprising Gold, Silver and Platinum .
Density (at 20° C) 19.050 g/cm 3 ... Spectral lines of uranium: Other properties; Natural occurrence: primordial: Crystal structure
This is an extended version of the energy density table from the main Energy density page: Energy densities table ... Natural uranium (99.3% U-238, 0.7% U-235) ...
Uranium is notable for the extremely high density of its metallic form: at 19.1 grams per cubic centimetre (0.69 lb/cu in), uranium is 68.4% more dense than lead. Depleted uranium, which has about the same density as natural uranium, is used when this high density is desirable but the higher radioactivity of natural uranium is not.
The SI unit of kilogram per cubic metre (kg/m 3) and the cgs unit of gram per cubic centimetre (g/cm 3) are probably the most commonly used units for density. One g/cm 3 is equal to 1000 kg/m 3 . One cubic centimetre (abbreviation cc) is equal to one millilitre.
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Density criteria range from above 3.5 g/cm 3 to above 7 g/cm 3. [17] Atomic weight definitions can range from greater than sodium (atomic weight 22.98); [ 17 ] greater than 40 (excluding s- and f-block metals, hence starting with scandium ); [ 18 ] or more than 200, i.e. from mercury onwards. [ 19 ]