Quart

From Wikipedia, the free encyclopedia

Categories: Units of volume | Imperial units | Customary units in the United States

For other uses, see Quart (disambiguation).

Look up quart in Wiktionary, the free dictionary.

The quart^[1] is an imperial and US customary unit of volume equal to a quarter of a gallon. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed. Three of these quarts remain in current use, all approximately equal to one liter.

Definitions

United States liquid quart: The US liquid quart is defined as one quarter of a US liquid gallon.

1 US liquid quart	=	1/4	US liquid gallons
	=	2	US liquid pints
	=	4	US liquid cups
	=	32	US fluid ounces
	=	57.75	cubic inches^[2]
	=	0.946352946	litres^[3]^[4]
	≈	33.307	imperial fluid ounces

United States dry quart: The US dry quart is defined as 1/32 of a US bushel.

1 US dry quart	=	1/32	US bushels
	=	1/4	US dry gallons
	=	2	US dry pints
	=	67.2	cubic inches
	=	1.101220942715	litres^[3]^[4]
	≈	38.758	imperial fluid ounces

Imperial quart: The imperial quart, used for both liquid or dry capacity, is defined as one quarter of an imperial gallon.

1 imperial quart	=	1/4	imperial gallons
	=	2	imperial pints
	=	40	imperial fluid ounces
	=	1.1365225	litres^[5]^[6]
	≈	69.355	cubic inches
	≈	38.430	US fluid ounces

Winchester quart

A Winchester quart is an archaic measure ^[7], roughly equal to 2 Imperial quarts or 2.25 litres. The 2.5 litre bottles, in which laboratory chemicals are supplied, are sometimes referred to as Winchester quart bottles although they contain slightly more than a traditional Winchester quart.

Notes and references

^ The term comes from the Latin quartus (meaning one-quarter) via the French quart. However, although the French word quart has the same root, it frequently means something entirely different. In Canadian French in particular, the quart is called pinte whilst the pint is called chopine.
^ One US liquid gallon is defined as 231 cubic inches.
^ ^a ^b This has been the exact conversion since the 1964 redefinition of the litre and the 1959 redefinition of the inch.
^ ^a ^b Guide for the Use of the International System of Units (SI)—US government publication
^ This has been the exact conversion since the redefinition of the imperial gallon in 1985 (UK), c. 1964 (Canada).
^ UK Units of Measurement Regulations 1995
^ http://www.hants.gov.uk/regulatory/tradingstandards/wmhistory.html