For example, in commerce, the net weight of retail products actually refers to mass and is properly expressed in pounds (U.S.) or kilograms. In everyday use, given that all masses on Earth have weight and this relationship is usually highly proportional, weight often serves to describe both properties, its meaning being dependent upon context. In the physical sciences, the terms “mass” and “weight” are rigidly defined as separate measures in order to enforce clarity and precision. The following is a list of the weights of a mass on the surface of some of the bodies in the solar system, relative to its weight on Earth: Relative weight on Earth, moon and other planets In this context the same equation is often written as W = mg, with W standing for weight, and g for the acceleration due to gravity. the weight), m is the mass of the object in question, and a is the acceleration due to gravity, on Earth approximately 9.8 m/s² or 32.2 ft/s²). Here, F is the force due to gravity (i.e. The equation for force is F = ma (force = mass × acceleration). Newton's second law is used to convert between weight (force) and mass: Weight, on the other hand, depends on the mass that is attracting it and the force with which it is being attracted. Mass is an intrinsic measure of an object and hence is independent of any external factors. Mass can be a constant while Weight varies. But the mass of that object will remain the same. Eg., If an object's mass is 60 kgs, then its Weight would be 600 Newtons but when taken to the Moon, this object will have a weight of 100 newton as the gravity of the moon is 1/6th that of the Earth. The weight of an object depends on the gravity at that place while Mass is always a constant at any place and any time. Methods may be interchanged if gravity is known and constant, as it is on earth. Mass may be measured using a pan balance while Weight may be measured using a spring balance. Mass of a body is measured by balancing it equally with another known amount of mass. Weight is measured using a scale which effectively measures the pull on the mass exerted by the gravity of the earth.
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