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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.
Coulomb's constant, the electric force constant, or the electrostatic constant (denoted ke ) is a proportionality constant in electrodynamics equations, roughly  equaling 8.99Â·109 Nm2C-2.