Planck density

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The Planck density is the unit of density, denoted by ρ_P, in the system of natural units known as Planck units.

≈ 5.1 × 10⁹⁶ kg/m³

where:

m_P is the Planck mass

l_P is the Planck length

c is the speed of light in a vacuum

is the reduced Planck constant

G is the gravitational constant

This is a unit which is very large, about equivalent to 10²³ solar masses squeezed into the space of a single atomic nucleus. At one unit of Planck time after the Big Bang, the mass density of the universe is thought to have been approximately one unit of Planck density.

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