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The letter u is often used to symbolize the greek letter mu, because it resembles it. Mu is used to denote micro- or 10^(-6). So... uM is a commonly used way to denote micrometers, or microns. ! x 10^-6 Meter. Pretty small stuff...

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βˆ™ 16y ago
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AnswerBot

βˆ™ 6mo ago

"Um" is not a standard unit in the metric system. It is possible that "um" is being used as an abbreviation for micrometer, which is a unit of length equal to one millionth of a meter.

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βˆ™ 14y ago

It is a measurement used to denote microns. It is equal to a x ^-6.

a = variable

x = multiply

^ = to the power of (exponent)

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βˆ™ 13y ago

Those are micrometers, which is 1m x 10^-6

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βˆ™ 15y ago

um stands for micrometer

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βˆ™ 15y ago

A Micro Meter

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Anonymous

Lvl 1
βˆ™ 4y ago

Upper-case "M" is the unit for Molar (or moles per litre), whereas lower-case "m" is the unit for metres.

Therefore:

µM = micromolar (also known as micromoles per litre)

µm = micrometre

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