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The dram (alternative British spelling drachm; apothecary symbol ʒ or ℨ; [a] abbreviated dr) [4] [5]: C-6–C-7 [6] is a unit of mass in the avoirdupois system, and both a unit of mass and a unit of volume in the apothecaries' system. [5]
The minim (abbreviated min, ♏︎ or ♍︎) is a unit of volume in both the imperial and U.S. customary systems of measurement. Specifically, in the imperial system, it is 1 ⁄ 60 of an imperial fluid drachm [1] [2] or 1 ⁄ 480 of an imperial fluid ounce; in the U.S. customary system, it is 1 ⁄ 60 of a US customary fluid dram or 1 ⁄ 480 of a US customary fluid ounce.
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 ...
Pinch ( 1 / 2 salt spoon [30] or 1 / 4 teaspoon: an amount of space that can accommodate 15 minims ( 1 / 4 fluid drachm or 1 / 32 fluid ounce) of liquid), if it is a dry ingredient; Drop (1 minim, [34] 1 / 4 fluid drachm, or 1 / 32 fluid ounce), if it is a liquid
fluid drachm (imperial) fl dr ≡ 1 ⁄ 8 fl oz (imp) = 3.551 632 8125 × 10 −6 m 3: fluid dram (US); US fluidram: fl dr ≡ 1 ⁄ 8 US fl oz = 3.696 691 195 3125 × 10 −6 m 3: fluid scruple (imperial) fl s ≡ 1 ⁄ 24 fl oz (imp) = 1.183 877 604 1 6 × 10 −6 m 3: gallon (beer) beer gal ≡ 282 cu in = 4.621 152 048 × 10 −3 m 3 ...
1963 c. 31 — Weights and Measures Act 1963 abolished the chaldron of coal, the fluid drachm and minim (effective 1 February 1971), discontinued the use of the quarter, abolished the use of the bushel and peck, and abolished the pennyweight (from 31 January 1969).
As an unofficial but once widely used unit of apothecaries' measure, the teaspoon is equal to 1 fluid dram (or drachm) and thus 1 ⁄ 4 of a tablespoon or 1 ⁄ 8 of a fluid ounce. [28] [29] The apothecaries' teaspoon was formally known by the Latin cochleare minus (cochl. min.) to distinguish it from the tablespoon or cochleare majus (cochl ...
In the United Kingdom, subsequent to the adoption of the minim and the creation of the British imperial system of units in the 1820s, a drop is defined as 1 British imperial minim, [3] the equivalence of 1 / 60 of a British imperial fluid drachm or 1 / 480 of a British imperial fluid ounce.