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.
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Id say a milligram of salt equals a milligram. A grain of salt is rediculously small, way smaller than a milligram, about 100 Micrograms
1,000 milligrams = 1 gram about 450 grams = 1 pound So about 450,000 milligrams in 1 pound. Of the choices you listed, the best match for a grain of salt has to be 1 milligram.
6mg = .006g 1000 milligram = 1 gram
1 grain = 60 mg = 0.06 g 0.06 grams are equal to a grain.
1 gr(grain) is equal to about 1/64th of a mg so 1 mg(milligram) is equal to 0.0154323584 gr(grains)
1 milligram = 1,000 micrograms 1 microgram = 0.001 milligram