All nuclei whether it is lighter hydrogen or heavier such as U-238 would have
the same density. Its value is 1.816 x 1017 kg/m3 .
(That's 181,600,000,000,000 times as dense as water, and 9,508,000,000 times
as dense as gold.)
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The density of uranium-234 is approximately 19.1 grams per cubic centimeter at room temperature.
The Moon's average density is about the same as the density of the Earth's mantle.
To sink, the object's density must be greater than the density of water.To sink, the object's density must be greater than the density of water.To sink, the object's density must be greater than the density of water.To sink, the object's density must be greater than the density of water.
-- If the object floats in water, then its density is less than the density of water. -- If the object sinks in water, then its density is more than the density of water. -- If the object floats in air, then its density is less than the density of air. -- If the object sinks in air, then its density is less than the density of air.
The quantity you are describing is density, which is the mass of a substance per unit volume. Mathematically, density (D) is represented as mass (m) divided by volume (V), so D = m/V.
The density of arcalic is approximately 1.05 grams per cubic centimeter.