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The metric, or SI, system has seven base units, from these seven all other units are derived.

Length- metre (m).

Time- second (s).

Mass- kilogram (kg).

Temperature- kelvin (K).

Electric current- ampere (A).

Luminous intensity- candela (cd).

Amount of substance- mole (mol).

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11y ago
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10y ago

It is not based on a substance: it is an abstract concept.

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Q: The metric system is based on what substance?
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