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the smallest particle (one or more atoms) of a substance that has all the properties of that substance
(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
(chemistry) a substance consisting of two or more substances mixed together (not in fixed proportions and not with chemical bonding)
Tells the reader how the information is being measured/reported, Tells the reader how the information is being measured/reported
a decimal system of weights and measures based on the meter and the kilogram and the second
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