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Density is defined as the mass per unit volume of a substance.

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Where does the energy density of black holes fit in a figure with the different energy densi... [closed]

With this equation we can see immediately that a black hole with the same mass as the Sun would have the (enormously high) density of 1.85×1019 kg/m3. … Alternatively, a super supermassive black hole with the mass of 4.3 billion Suns would have a density equal to one i.e. the same density as water.` …