Where does this come from, and can I check it?

Kilo multiplies by a thousand and milli divides by the same amount. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

Is this really a science fact?

Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

What else can I read about it?

The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

SI prefixes scale measurements by powers of ten

Kilo multiplies by a thousand and milli divides by the same amount Each prefix names a power of ten, from yocto at 10 to the minus 24 up to yotta at 10 to the 24. In 2022 the system gained ronna and quetta above yotta and ronto and quecto below yocto. Engineers pick the prefix that keeps a number between one and a thousand, which is why wavelengths are quoted in nanometres. It sits in Mondo's science collection, one of 200 facts that each trace back to the reference below.

Where this comes from

NIST

Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.

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Tags: measurement, units, maths

SI prefixes scale measurements by powers of ten: the short answers

Where does this come from, and can I check it?: Kilo multiplies by a thousand and milli divides by the same amount. The figure is taken from NIST, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a science fact?: Yes. It sits on the Science shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.