Planck mass / energy equivalent (GeV)

In physics, the Planck Mass is the unit of mass in the system of natural units known as Planck units. This constant, `m_p *c^2` defines the mass energy equivalent of the Plank mass multiplied by the speed of light squared. It is defined using:  c, the speed of light in a vacuum; G, the gravitational constant;  and the Planck constant. over 2Pi.

The unit is named after Max Planck. The unit measures the approximate scale at which quantum effects, here in the case of gravity, become important. This unit is expressed in units of gigaelectronvolts (`"GeV"* c^2`).

Notes

This constant the Planck mass / energy equivalent in GeV is specified with standard uncertainty (standard deviation) of 0.000073 x `10^19` GeV

See Uncertainty of Measurement Results, a discussion provided by NIST of the application of uncertainty to the documented constants.