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A chart of Imperial and United States customary units. The barleycorn is an English unit of length [1] equal to 1 ⁄ 3 of an inch (i.e. about 8.47 mm). It is still used as the basis of shoe sizes in English-speaking countries.
The teaspoon, tablespoon, and cup are defined in terms of a fluid ounce as 1 ⁄ 6, 1 ⁄ 2, and 8 fluid ounces respectively. The fluid ounce derives its name originally from being the volume of one ounce avoirdupois of water, [21] but in the US it is defined as 1 ⁄ 128 of a US gallon. Consequently, a fluid ounce of water weighs about 1.041 ...
Thus, while the imperial fluid ounce is 3.924% smaller than the US fluid ounce, the imperial gallon, quart, pint and gill are all 20.095% larger than their US counterparts. [e] One avoirdupois ounce of water has an approximate volume of one imperial fluid ounce at 62 °F (16.7 °C) [f]: this convenient fluid ounce to avoirdupois ounce relation ...
1 US dry quart ≡ 1 / 32 US bushel: ≡ 2: US dry pints ≡ 1.101 220 942 715: liters [7] [8] ≡ 67.200 625: cubic inches ≡ 107521 / 369600 US gallon ≡ 1 15121 / 92400 US liquid quarts ≡ 2 15121 / 46200 US liquid pints ≡ 9 3571 / 11550 US gills ≡ 37 1367 / 5775 US fluid ounces ≈ 0. ...
The cup is a cooking measure of volume, commonly associated with cooking and serving sizes.In the US, it is traditionally equal to one-half US pint (236.6 ml). Because actual drinking cups may differ greatly from the size of this unit, standard measuring cups may be used, with a metric cup commonly being rounded up to 240 millilitres (legal cup), but 250 ml is also used depending on the ...
It may be that all English-unit derived capacity measurements are derived from one original approximate measurement: the mouthful, consisting of about 1 ⁄ 2 ounce, called the ro in ancient Egypt (their smallest recognized unit of capacity). [4] [5] The mouthful was still a unit of liquid measure during Elizabethan times. [6]
Modern measurements of Vienna Standard Mean Ocean Water, which is pure distilled water with an isotopic composition representative of the average of the world's oceans, show that it has a density of 0.999 975 ± 0.000 001 kg/L at its point of maximum density (3.984 °C) under one standard atmosphere (101.325 kPa) of pressure.
As an imperial fluid ounce is 96.076% of a US fluid ounce, this means that one imperial gallon, quart, pint, cup and gill are all equal to 1.20095 of their US counterparts. Historically, a common bottle size for liquor in the US was the " fifth ", i.e. one-fifth of a US gallon (or 0.08% more than a "reputed quart", one-sixth of an imperial gallon).