1 micrometer has 1,000 nanometers in it.
So:
-- 1 nanometer is smaller than 1 micrometer.
-- The number of micrometers in any length is smaller than
the number of nanometers in the same length.
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divide by 1,000
5
1 micrometre = 1000 nanometres so 1000 micrometres = 1 million nanometres
1000 nanometres = 1 micrometre so 50 nm = 50/1000 mcm = 0.05 micrometres. Simple!
A micrometer is 1 millionth of a meter and a nanometer is 1 billionth. 1000 billionths is equivalent to 1 milionth, or 1 micrometer. That is because 1 billion is 1000 millions.