The weight of a body is the measure of the gravitational force exerted by the Earth on it. It is defined as the force with which a body is attracted towards the center of the Earth. If g is the acceleration due to gravity at a particular location, then a body with mass m experiences a gravitational force mg towards the Earth’s center. Therefore, the weight of a body is given by W = mg.

In vector form, this is expressed as W = mg. Weight is a vector quantity and is measured in units of force, such as newtons or kilogram-force (kgf). Since the value of g varies from place to place, the weight of a body also changes depending on its location.