Planck mass Guide, Meaning , Facts, Information and Description

The Planck mass is the natural unit of mass, denoted by m_P.

m_P = (c / G)^1/2 ≈ 2.1 × 10^-8; kg

where:

c is the speed of light

is Dirac's constant

G is the gravitational constant

Unlike most of the other Planck units, the Planck mass is on an approximately human scale, being roughly the mass of some fleas. The issue is that general relativity predicts that smaller black holess can exist within an event horizon of radius less than the Planck length, while quantum mechanics predicts that the mass would probably be outside the event horizon.

See also

• Natural units
• Planck length
• Planck time

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