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C-6–C-7 The dram apothecaries is equal to 3 scruples (s ap or ℈) or 60 grains (gr), [5]: C-7 or exactly 3.887 9346 grams. [5]: C-14 C-14 "Dram" is also used as a measure of the powder charge in a shotgun shell, representing the equivalent of black powder in drams avoirdupois.
Grains are used worldwide for measuring gunpowder and smokeless powder charges. Historically, the dram (27 + 11 ⁄ 32 grains; not to be mixed up with the apothecaries' dram of 60 grains) has also been used worldwide for measuring gunpowder charges, particularly for shotguns and large black-powder rifles.
English-speaking countries also used a system of units of fluid measure, or in modern terminology volume units, based on the apothecaries' system. Originally, the terms and symbols used to describe the volume measurements of liquids were the same as or similar to those used to describe weight measurements of solids [33] (for example, the pound by weight and the fluid pint were both referred to ...
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
default conversion combinations SI: kilogram: kg kg 1.0 ... dram (none) grain: gr gr equivalent to the troy grain 1.0 ...
dram now meant only avoirdupois drams, which were 1 ⁄ 16 of an avoirdupois ounce. An ounce consisted of 437.5 grains, thus making the dram approximately 27.34 grains. drachm now meant only apothecaries' drachms, which were 1 ⁄ 8 of an apothecaries' ounce of 480 grains, thus equal to 60 grains.
The tower "wheat" grain was defined as exactly + 45 ⁄ 64 (≈ + 3 ⁄ 4) of the troy "barley" grain. [ 1 ] : 74 Since the implementation of the international yard and pound agreement of 1 July 1959, the grain or troy grain (symbol: gr ) measure has been defined in terms of units of mass in the International System of Units as precisely 64.798 ...
Chart showing the relationships of weight measures. The Avoirdupois, Troy and Apothecary systems of weights all shared the same finest unit, the grain; however, they differ as to the number of grains there are in a dram, ounce and pound. This grain was legally defined as the weight of a grain seed from the middle of an ear of barley.