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There is no such thing as smallest unit in the metric system. For example, the official prefix for the smallest unit is "yocto-", which is one septillionth (10^-24). But measurements can go on to 10^-11 yoctometres which is the Planck length, the smallest measurable distance.

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7y ago
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11y ago

The prefix which denotes the smallest fraction of a base unit is yocto-. Yocto represents 1 x 10-24, so one yoctometre is 0.000 000 000 000 000 000 000 001 metres.

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Q: What is the least unit of measurement in the metric system?
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