Question

what is the law of conservation of mass

Answer 1

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as system's mass cannot change, so quantity cannot be added nor removed. Hence, the quantity of mass is conserved over time.

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Answer 2

The law of conservation of mass states that mass can neither be created or be destroyed.