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Mass A rather small mass, such as a dose of medicine or the mass of the air in a jar.
A grain of salt does not equal 1 milligram; rather, it is approximately 58 milligrams. This discrepancy arises from the historical use of the grain as a unit of measurement in the apothecaries' system, where 1 grain is defined as 1/7000th of a pound. In contrast, the metric system defines 1 milligram as 1/1000th of a gram. Therefore, a grain of salt is significantly larger than 1 milligram.
1 milligram = 1,000 micrograms 1 microgram = 0.001 milligram
milligram
Milligram