1 mm = 1000 microns so 0.02 mm = 0.02*1000 = 20 microns. Simple!
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1 micron is a millionth of a metre
1/10000
Yes - a 5 micron will filter out much smaller particles than a 30 micron.
1 micron = 3.93700787 × 10-5 inches
10 micron.