GRAIN (MEASURE)

A 'grain' (symbol: 'gr') is a unit of mass now equal to exactly 64.79891 milligrams, in all English mass and weight systems (avoirdupois, Apothecaries’ and troy).
An avoirdupois ounce is equal to 437.5 grains, whereas a troy ounce is equal to 480 grains. With the differing number of ounces in their respective pounds, an avoirdupois pound is 7,000 grains, whereas a troy pound is 5,760 grains. There have been other English pounds with round sizes in grains.
A 'metric' or 'pearl grain' is equal to 50 milligrams or of a carat as used in pearl and diamond nomenclature.
Originally, a grain was the weight of a grain seed from the middle of an ear of barley;
64 wheat berries were set to weigh as much as 45 barleycorns (i.e., a wheat kernel was conventionally considered to be ⁴⁵⁄₆₄ of the ''grain'' used as a unit of mass). (A barleycorn was also inch as a unit of length).

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Usage

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References

Usage

Grains are currently used in the United States and Canada Marstar Canada: Ammunition and Reloading Supplies to measure the mass of bullets and gunpowder, and scales for handloading measure in grains; bullets are generally measured in increments of 1 grain, gunpowder in increments of 0.1 grains. Grains are used to weigh the tools involved in the sport of fencing, including the foil. Grains are used to measure arrows, and arrow parts Canadian Tire en ligne : Magasiner au Canada in archery. Grains are also used in environmental permitting to quantify particulate emissions.
Grains are used to measure the amount of moisture in air, a measure of absolute humidity

See also

★ English unit

★ Imperial unit

★ United States customary units

References