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Metric prefixes



Colin Fine writes:

> I have never come across mF (millifarads), meV
>(milli-electron volts) Mg (megagrams) or exa-, femto- or atto- anything.

You ought to have come across megagrams, except that people insist on calling
them "tonnes." SI would insist on megagrams.

Nuclear physicists do use femtometers (formerly called fermis).