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The United States customary system developed from English units that were in use in the British Empire before the U.S. became an independent country. The United Kingdom's system of measures evolved by 1824 to create the imperial system (with imperial units ), which was officially adopted in 1826, changing the definitions of some of its units.
The table of imperial avoirdupois mass is the same as the United States table up to one pound, but above that point, the tables differ. One important difference is the widespread use in Britain of the stone of 14 pounds ( 6.350 293 18 kg ) for body weight, whereas this unit is not used in the United States, although flour was sold by a barrel ...
The US Customary system of units makes use of set of dry units of capacity that have a similar set of names [Note 7] to those of liquid capacity, though different volumes: the dry pint having a volume of 33.6 cubic inches (550 ml) against the US fluid pint's volume of 28.875 cubic inches (473 ml) and the imperial pint of 34.68 cubic inches (568 ...
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 ...
cup (US customary) c (US) ≡ 8 US fl oz ≡ 1 ⁄ 16 gal (US) = 236.588 2365 × 10 −6 m 3: cup (US food nutrition labeling) c (US) ≡ 240 mL [18] = 2.4 × 10 −4 m 3: dash (imperial) ≡ 1 ⁄ 192 gi (imp) = 1/8 tsp (imp) = 739.923 502 604 1 6 × 10 −9 m 3: dash (US) ≡ 1 ⁄ 48 US fl oz = 1/8 US tsp = 616.115 199 218 75 × 10 −9 m 3 ...
The US fluid ounce is based on the US gallon, which in turn is based on the wine gallon of 231 cubic inches that was used in the United Kingdom prior to 1824. With the adoption of the international inch , the US fluid ounce became 1 ⁄ 128 gal × 231 in 3 /gal × (2.54 cm/in) 3 = 29.573 529 5625 mL exactly, or about 4.084% larger than the ...
US customary dry measure: US dry barrel: USdrybbl US dry bbl 105/32 US bsh 1.0 US dry bbl (0.12 m 3) U.S.drybbl U.S. dry bbl US bushel: USbsh US bsh 2150.42 cubic inches by definition 1.0 US bsh (35 L; 8.0 US dry gal; 7.8 imp gal) U.S.bsh U.S. bsh US bushel: USbu US bu 2150.42 cubic inches by definition
A metric ounce is an approximation of the imperial ounce, US dry ounce, or US fluid ounce. These three customary units vary. However, the metric ounce is usually taken as 25 or 30 ml (0.88 or 1.06 imp fl oz; 0.85 or 1.01 US fl oz) when volume is being measured, or in grams when mass is being measured.