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Date:         Tue, 11 Feb 1992 16:34:00 EST
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From: "61510::GILSON" <cbmvax!uunet!cuvmb.cc.columbia.edu!gilson!61510.decnet>
Subject:      Metric prefixes
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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).