Question

What is gravitational constant?

Answer 1

Gravitational constant, denoted by the letter 'G', is a physical constant involved in the calculation of gravitational effects. According to Newton's law of universal gravitation, the gravitational force acting between two masses $m_1$ and $m_2$, separated by a distance $R$ is given by
F= $\frac{G{m}_1{m}_2}{R^2}$ where G is the universal gravitational constant.

The universal gravitational constant is the gravitational force acting between two bodies of unit mass, kept at a unit distance from each other.