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    What does the symbol um for thickness mean.

    0  Views: 1132 Answers: 1 Posted: 13 years ago

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    um, ums
    symbols sometimes used for the micrometer (micron). The symbol um is acceptable in situations where the Greek letter mu (µ) is not available to make the proper symbol µm. However, the "plural" symbol ums is never acceptable, because the SI prohibits adding -s to a symbol to form a plural.



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