Gravitational Constant, G

The Gravitational Constant is an empirical physical constant in physics, used in calculations where universal gravitation and the effects of the force of gravity are at play.

The measured value of the gravitational constant is known to four digits, with a reasonable degree of certainty, and is measured in SI Units as 6.6743 × 10^-11 m³·kg^-1·s^-1. (Although there are a couple other units that it is measured in.)