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Conservation of mass
The law of conservation of mass states that the mass of a system of substances is constant, regardless of the processes acting inside the system. An equivalent statement is that matter changes form, but cannot be created or destroyed. This implies that for any chemical process in a closed system, the mass of the reactants must equal the mass of the products.
The law was first clearly and unambiguously formulated by Antoine Lavoisier, who is often referred to as the father of modern chemistry. However, other scientists such as Mikhail Lomonosov had previously expressed similar ideas.
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