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1. It is the acceleration acquired by a body due to the earth's gravitational pull on it. 

2. The 'g' is different at different place on the surface of the earth. Its value varies from one celestial body to anothe.

3. It is a vector quantity.

It is numerically equal to the force of attraction between two masses of 1 kg each separated by a distance of 1m. 

The 'G' is a universal constant, i.e., its value is the same viz., 6.7 × 10^-11 Nm² kg^-2 every where in the universe

It is a scalar quantity.