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The law of conservation of matter states that matter can be neither created nor destroyed during a chemical reaction. This means that all the atoms present before a reaction must be present after the reaction, and that the total mass of a system does not change as the result of a chemical reaction.
There is a scientific law called the Law of Conservation of Mass, discovered by Antoine Lavoisier in 1785. In its most compact form, it states: matter is neither created nor destroyed. In 1842, Julius Robert Mayer discovered the Law of Conservation of Energy. In its most compact form, it it now called the First Law of Thermodynamics: energy is neither created nor destroyed. In 1907 (I think), Albert Einstein announced his discovery of the equation E = mc 2 and, as a consequence, the two laws above were merged into the Law of Conservation of Mass-Energy: the total amount of mass and energy in the universe is constant.