Mechanics

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Antoine Lavoisier stated that "The law of conservation of mass means that the atoms of an object cannot be created or destroyed, but can be moved around and be changed into different particles."

This law says that when a chemical reaction rearranges atoms into a new product, the mass of the reactants (chemicals before the chemical reaction) is the same as the mass of the products (the new chemicals made). More simply, whatever you do, you will still have the same amount of stuff.