Chemistry / Chem 0037 · Atom · ~20 seconds
Pure Substance
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A pure substance has a constant composition, so every sample of it has exactly the same makeup and physical properties.
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Any sample of pure copper has the identical density and melting point regardless of the mine it came from.
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"Pure" here means constant composition, not "natural" — a substance made in a lab can be equally pure as one from a plant.