One. They are equivalent measures.
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A micrometer is one millionth of a meter, a millimeter is one thousandth of a meter. So there are one thousand micrometers in a millimeter.
There are 1,000 micrometers in one millimeter.
50000 micrometers
1 millimeter=1,000 micrometers
1 micrometer = .001 millimeter 1000 micrometers in one millimeter (mm) = 10^-3 (um) = 10^-6