The law of conservation of mass states that mass cannot be created or destroyed in a closed system through ordinary chemical reactions or physical changes. This principle means that the total mass of the reactants in a chemical reaction equals the total mass of the products. In other words, matter is transformed from one form to another, but the total amount of matter remains constant. This law is fundamental in chemistry and was first formulated by Antoine Lavoisier in the late 18th century.
The law of Conservation of Mass states that:
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