G = 6.6738480x10-11 m3kg-1s-2
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The gravitational constant denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies
what is dimnsion of gravitational constant
You measure the gravitational force between two objects - this can be done with a Cavendish balance. Then you plug in the numbers (masses, and force) into the universal formula for gravitation.
Inertia
Use the universal law of gravitation, insert the known value for the gravitational constant, and use the fact that each kilogram is attracted by a force of 9.8 Newton.