Law of conservation of matter

:See also: Law of Conservation of Mass

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The Law of Conservation of Energy basically states that energy cannot be created or destroyed, but can change its form.

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The Law of Conservation of Mass basically states that mass cannot be created or destroyed, but can change its form.

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In classical physics energy is conserved because of the nature of forces. There could be forces according to the Laws of Newton without conserve energy but there are not (so this have to be an axiom).

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In classical physics mass is conserved for kinematic reasons, as there is no way to change the mass and conserve the momentum for all observers at the same time.

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The Law of Conservation of Matter was first clearly and unambiguously formulated by Antoine Lavoisier, who is often referred to as the father of modern chemistry.

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Lavoisier used mass as measure of matter, so he states:

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• In a chemical reaction, the sum of the mass of the reactants equals the sum of the mass of the products.
 
Law of conservation of matter: Atoms ►