Planck density
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The Planck density is the natural unit of density, denoted by ρP.
ρP = Planck mass / (Planck length)3 = <math> c^5 /(\hbar G^2 )<math> ≈ 5.1 × 1096 kg/m3
where:
c is the speed of light in a vacuum
<math>\hbar<math> is Dirac's constant
G is the gravitational constant