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Measurement of mass : Depending upon the manner in which mass of a body is measured, there are two different concepts about the mass of a body. These are: a) Gravitational mass and b) Inertial mass. The methods of measurements of these masses are given as under: 1. Measurement of mass (Measurement of gravitational mass): a) Gravitational mass is the mass of the body which determines the gravitational pull exerted on it due to the earth. In order to measure the gravitational mass of a body, a common balance is used. The body is placed in the left pan, while the standard weights in the right pan. The gravitational force on the body and standard weights are made equal and the mass of the body is determined. b) We can measure the Gravitational mass of a body by using a spring balance also. Actually, the spring balance measures the weight of a body. When a body is suspended from a spring balance, it stretches the spring. The elongation produced in the spring is direc...