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Grain, unit of 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. Originally, a grain was the weight of a grain seed from the middle of an ear of barley. Grains are still used as a measure for older drugs such as aspirin and nitroglycerin, though the milligram has almost completely replaced them. Grains are currently used in the United States and Canada [1] 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. |
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kilogram, gram, exagram, petagram, teragram, gigagram, megagram, hectogram, dekagram, decigram, centigram, milligram, microgram, nanogram, picogram, femtogram, attogram, dalton, kilogram-force square second/meter, kilopound, kip, slug, pound-force square second/foot, pound, pound (troy or apothecary), ounce, ounce (troy or apothecary), poundal, ton (short), ton (long), ton (assay) (US), ton (assay) (UK), ton (metric), kiloton (metric), quintal (metric), hundredweight (US), hundredweight (UK), quarter (US), quarter (UK), stone (US), stone (UK), tonne, pennyweight, scruple (apothecary), carat, gamma, talent (Biblical Hebrew), mina (Biblical Hebrew), shekel (Biblical Hebrew), bekan (Biblical Hebrew), gerah (Biblical Hebrew), talent (Biblical Greek), mina (Biblical Greek), tetradrachma (Biblical Greek), didrachma (Biblical Greek), drachma (Biblical Greek), denarius (Biblical Roman), assarion (Biblical Roman), quadrans (Biblical Roman), lepton (Biblical Roman), Planck mass, Atomic mass unit, Electron mass (rest), Muon mass, Proton mass, Neutron mass, Deuteron mass, Earth's mass, Sun's mass
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