Planck density
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Planck_density".

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

\rho_P = \frac{m_P}{l_P^3} = \frac{c^5}{\hbar G^2} ≈ 5.1 × 1096 kg/m3

where:

mP is the Planck mass
lP is the Planck length
c is the speed of light in a vacuum
\hbar is Dirac's 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.

content
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Planck's natural units
Base Planck units
Derived Planck units
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