1000 nanograms = 1 microgram so 2 nanograms = 2/1000 = 0.002 micrograms. Simple!
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10 milliograms = 10-2 grams 1 nanogram = 10-9 grams So 10 milligrams = 107 (10 million) nanograms
2 megagrams is more commonly called 2 metric tonnes. Mega means 1,000,000 and micro means 1/1,000,000. Therefore there are 2,000,000,000,000 micrograms in 2 megagrams.
1 microgram = 1/1,000,000g 1 milligram = 1/1000g so 2 micrograms = 0.002 milligrams
It would depend on the density of the substance. For water (which has a density of 1g/cm3): 2 milliliters = 2 grams = 2 000 000 micrograms
Multiply 6.2*102 by 109 to get 6.2*1011 nanograms