Quote Originally Posted by JimmyHAD View Post
A friend told me just yesterday that a micron is a millionth of an inch.
I wouldn't trust that friend if I were you, he's off by a factor of roughly 40.
A micron is short for a micrometer, so it's one millionth of a meter.
1inch = 0.0254meters

BTW you can do math and conversions on Google too. Type
'1micron in inches' or '1micron in meters' or '1meter in microns'
or whatever number you want for that matter.

Since I have a browser with a google bar opened all the time I usually do quick calculations there. It's faster than typing bc -l or octave...