In the metric system what is a um?

Answer 1

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...

Answer 2

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

a = variable

x = multiply

^ = to the power of (exponent)

Answer 3

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

Answer 4

um stands for micrometer

Answer 5

A Micro Meter

Answer 6

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