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micron vs. nanometer

[ mahy-kron ]
noun,
  1. the millionth part of a meter. Symbol: μ, mu
  2. a colloidal particle whose diameter is between 0.2 and 10 microns.
  3. a very small unit of pressure, equal to that exerted by a column of mercury 1μ high.
[ nan-uh-mee-ter, ney-nuh- ]
noun
  1. one billionth of a meter. Abbreviation: nm

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