What is mass?

Mass is defined by the quantity of matter of a substance. In general, weight is used to measure an object. It is not correct, weight is the gravitational pull of the earth on the body. The mass of a body remains it everywhere, but the weight may vary. For example, the weights of a body become one-sixth of its value on the moon, since moon’s gravitation is one-sixth of the earth. But mass of the body is same.
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