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The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
Such milk bottles are no longer officially referred to as pints. However, the "pint glass" in pubs in Australia remains closer to the standard imperial pint, at 570 mL. It holds about 500 mL of beer and about 70 mL of froth, except in South Australia, where a pint is served in a 425 mL glass and a 570 mL glass is called an "imperial pint".
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 ...
[c] In the British Empire, the Winchester bushel was replaced with an imperial bushel of eight imperial gallons, with the subdivisions of the bushel being maintained. As with US dry measures, the imperial system divides the bushel into 32 quarts or 64 pints. Thus, these imperial measures are 3.2% larger than are their US dry-measure counterparts.
In 1965, the UK began an official programme of metrication, and as of 2025, in the United Kingdom the metric is the official measurement system for all regulated trading by weight or measure purposes, however imperial pint remains the sole legal unit for milk in returnable bottles and for draught beer and cider in British pubs.
The British imperial system uses a stone of 14 lb, a long hundredweight of 112 lb and a long ton of 2,240 lb. The stone is not a measurement of weight used in the US. The US customary system uses the short hundredweight of 100 lb and short ton of 2,000 lb. Where these systems most notably differ is in their units of volume.
There is government policy and metric (SI) program to implement and assist with metrication; however, there is major social resistance to further metrication. [3] [4] [5] In the U.S., the SI system is used extensively in fields such as science, medicine, electronics, the military, automobile production and repair, and international affairs.
Half of a gill is a jack, or one-eighth of a pint. [2] But in northern England, a quarter pint could also be called a jack or a noggin, rather than a gill, and in some areas a half-pint could be called a gill, particularly for beer and milk. [3] [4] [5] In Scotland, there were additional sizes: [6] big gill = 1 + 1 ⁄ 2 gills (213.1 mL)