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The mass (m) of a body is the measure of the amount of material present in that body. The weight (wt) of a body is the force exerted by that body when its mass is accelerated in gravitational field. Mass and weight are related as shown in following Equation:

Note that gc has the same numerical value as the acceleration of gravity at sea level, but is not the acceleration of gravity. Rather, it is a dimensional constant employed to facilitate the use of

Newtons Second Law of Motion with the English system of units.

The weight of a body is a force produced when the mass of the body is accelerated by gravitational acceleration. The mass of a certain body will remain constant even if the gravitational acceleration acting upon that body changes. 

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