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Weight.
1 microgram = 1,000 nanograms
1 nanogram = 0.001 microgram
The difference between 1 microgram and 1 nanogram is 999 nanograms.
mg = milligram
mcg = microgram
A milligram is 1000 times bigger than a microgram. One milligram = 0.001gOne microgram = 0.000001g
ug is the easiest way to type µg, which means microgram. Therefore there is 1ug in a microgram as they are the same.