G /(hbar*c) (Gravitational Constant) : `(GeV/c^2)^2`
The constant defines the value of the Universal Constant of Gravitation, G, divided by the product of `barh` (the Planck constant over 2*pi) and c, the speed of light in a vacuum. This version of the constant is expressed in units of `(GeV/c^2)^2`. This constant may also be referred to as the Newtonian constant of gravitation over h-bar c.
This constant is specified with the standard uncertainty of `0.00080*10^(-11) m^3 / (kg*s^2)`
The relative standard uncertainty is `1.2 x 10^(-4)`