Id say a milligram of salt equals a milligram. A grain of salt is rediculously small, way smaller than a milligram, about 100 Micrograms
A grain of salt.
a single grain of salt
It would depend on the type of salt. If it's normal table salt, then no, you cannot see it with the naked eye.
It's ubiquitous. To get the amount, look at the label, and multiply the "sodium" milligram-number by 2 and 1/2. That will give you the salt-content in milligrams.
The answer depends on the kind of salt that it refers to. A grain of table salt has a mass of a third to two-thirds milligrams. Large salt crystals, like those used in salt grinders (or for margaritas) have a mass of a milligram or more. The question is ambiguous: like "how long is a piece of string?"
There is one milligram in one milligram.
1 milligram = 1,000 micrograms 1 microgram = 0.001 milligram
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A milligram is metric.