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Answer:
The law of conservation of mass says that mass cannot be made or destroyed in a closed system during normal chemical reactions or physical changes.
This means the total mass of the reactants before a reaction is the same as the total mass of the products after the reaction. In simpler terms, the amount of matter stays the same throughout any process.
For example, when wood burns, the mass of the wood and oxygen before burning is equal to the mass of the ash, gases, and other products after burning. This principle is key in chemistry and helps us balance chemical equations.