Nature is made up of various living and non living things, and all these together are known as the mass of the earth. Therefore, if we have to define mass, in physics, it would be "the quantity of matter as determined from its weight". But, in common terms, to find the weight of the mass, the value of the force of gravity acting on that mass is considered. You must have read about the very famous Newton's law of conservation of energy, which includes some basic principles about the energy
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