A quart is a unit of measurement for volume. It is equal to two pints. There are several different units known as a pint, and so there are accordingly several different quarts. A quart may refer to: Look up quart, Quart in Wiktionary, the free dictionary. ... Measurement is the determination of the size or magnitude of something. ... The volume of a solid object is the three-dimensional concept of how much space it occupies, often quantified numerically. ... The pint is a unit of volume or capacity. ...

• US liquid measure:
  • equal to two US liquid pints
  • equal to four US liquid cups
  • defined as one quarter of a US gallon
  • equal to 32 US fluid ounces
  • equal to 0.946352946 litres

• US dry measure ("dry quart"):
  • equal to two US dry pints
  • defined as 1/32 of a US bushel
  • equal to 67.2 cubic inches
  • equal to 1.101220 litres

In imperial (UK & Canadian) measure a quart is a measure of capacity, liquid or dry U.S. customary units, commonly known in the United States as English units or standard units, are units of measurement that are currently used in the U.S., in some cases alongside units from SI (the International System of Units—the modern metric system). ... The cup is a unit of measurement for volume, used in cooking to measure bulk foods like chopped vegetables (an example of a dry measurement) or liquids like milk (fluid measurement). ... The gallon (abbreviation: gal) is a unit of volume. ... A fluid ounce is a unit of volume in both the Imperial system of units and the U.S. customary units system. ... The litre or liter (see spelling differences) is a unit of volume. ... Dry measures are units of volume used to measure bulk commodities which are not liquid. ... A table of weights from the secretaries of the different states, showing the no. ... ‹ The template below (Unit of length) is being considered for deletion. ... The Imperial units or the Imperial system is a collection of English units, first defined in the Weights and Measures Act of 1824, later refined (until 1959) and reduced. ...

• Imperial measure:
  • equal to two imperial pints
  • defined as one quarter of an imperial gallon
  • equal to 40 imperial fluid ounces
  • equal to 1.1365225 litre exactly

The UK legal definition of the (imperial) quart is 1.1365225 litres precisely in The Units of Measurement Regulations 1995
http://www.hmso.gov.uk/si/si1995/Uksi_19951804_en_2.htm

Translation notes

When translating to and from French, be aware that although the word quart has the same root, it frequently means something entirely else (the word just means "fourth", after all). In Canada in particular, the quart is the pinte whilst the pint is the chopine. The pint is a unit of volume or capacity. ...

Reference

Guide for the Use of the International System of Units (SI) US government publication; includes US-(liquid)-to-litre & imperial-to-litre conversion