The Dalton is defined as the mass of a hydrogen atom ... 1.657 x 10-24 gram.
Units of mass can't be converted to units of length.
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2 millimeters=2,000 micrometers
4 centimeters=40,000 micrometers
20 millimeters = 20,000 micrometers 20 micrometers = 0.02 millimeters
Multiply by 1000
1 micrometer = 1x10^-6 metres 1 mm = 1x10^-3 metres This means that to convert micrometers into millimeters, you need to multiply by 1000. 918 micrometers = 918 000 mm