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The gravitational constant, approximately 6989667400000000000â 6.674Ã10â11 Nâm2/kg2 and denoted by letter G, is an empirical physical constant involved in the calculation(s) of gravitational force between two bodies.
Fg= GM1M2/R. This shows that the gravitational force between two masses is found by product of their masses, times the gravitational constant â G, and divided by the square of distance between them. The value of G was originally determined experimentally by Henry Cavendish and has a value of 6.67x10 N (m/kg-s)