Grain (unit)
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A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and apothecaries' systems, equal to exactly 64.79891 milligrams. It is nominally based upon the mass of a single ideal se
The small golden disc close to the 5 cm marker is a piece of pure gold weighing one grain. Shown for comparison is a tape measure and coins of various world currencies.
A box of .38 Special (9.1 mm) cartridges that have 148-grain (9.6 g) bullets
A five-grain aspirin. The usage guidance label on a bottle of aspirin indicates that the dosage is "325 mg (5 gr)".
Troy weight
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Troy weight is a system of units of mass whose origin is uncertain. By far the most common troy unit is the troy ounce, the standard mass unit for precious metals in industry and in trade; it equals 3
Grain (unit)
…A grain is a unit of measurement of mass, and in the troy weight, avoirdupois, and apothecaries' systems, equal to exactly 64.79891 milligrams. It is nominally based upon the mass of a single ideal seed of a cereal…
Troy ounce is a traditional unit of gold – this sample marked "999,9" is four nines fine (see: Fineness § Gold), meaning it is pure to 999.9 parts in 1,000 (i.e.99.99% pure)
One troy ounce (480 grains; 31 grams) samples of germanium, iron, aluminium, rhenium and osmium. The differences in size are due to differences in density.
The standard British troy pound manufactured in 1758; it bears the abbreviation ℔ ("pound") and the letter "T" for troy.