<Dl> <Dd> G = l P 3 m P t P 2 . (\ displaystyle G = (\ frac (l_ (\ rm (P)) ^ (3)) (m_ (\ rm (P)) t_ (\ rm (P)) ^ (2))).) </Dd> </Dl> <Dd> G = l P 3 m P t P 2 . (\ displaystyle G = (\ frac (l_ (\ rm (P)) ^ (3)) (m_ (\ rm (P)) t_ (\ rm (P)) ^ (2))).) </Dd> <P> In other words, in Planck units, G has the numerical value of 7000100000000000000 ♠ 1 . </P> <P> Thus, in Planck units, and other natural units taking G as their basis, the gravitational constant cannot be measured as it is set to its value by definition . Depending on the choice of units, variation in a physical constant in one system of units shows up as variation of another constant in another system of units; variation in dimensionless physical constants is preserved independently of the choice of units; in the case of the gravitational constant, such a dimensionless value is the gravitational coupling constant, </P>

Define gravitational constant what are the units of gravitational constant