The mass of a body can be defined as the measure of the amount of matter that is present inside the body. Its SI unit is kilograms (kg). For a given body, the mass rarely changes for any given time. However, if a large amount of energy is taken out or given to the body, there may be a change in the mass of the body. For an instance, in the case of a nuclear reaction, a huge amount of energy is converted from a very little amount of energy which results in the reduction of mass of the substance.
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