Answer to Question #94192 in Mechanics | Relativity for Quita

Question

A human is approximately 48um in diameter. Express this diameter in meter

Answer 1

First of all, a human is much larger than 48 um in diameter, so I assume the question is about a human's hair width.

um is an abbreviation for micrometre a.k.a. micron, whereas correct abbreviation is $\mu\text{m}$ with Greek letter $\mu$.

More info on this unit of length: https://en.wikipedia.org/wiki/Micrometre

Conversion to meters:

$48 \space\mu\text{m} = 48\cdot10^{-6}\text{ m}.$