The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. ... If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
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At a front, the two air masses have different densities, based on temperature, and do not easily mix. One air mass is lifted above the other, creating a low pressure zone.
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runoff is he draining away of water (or substances carried in it) from the surface of an area of land, a building or structure, etc.
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Adding hot cocoa to hot water would be a chemical change
