Английская Википедия:Gallon

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The gallon is a unit of volume in British imperial units and United States customary units. Three different versions are in current use:

• the imperial gallon (imp gal), defined as Шаблон:Val, which is or was used in the United Kingdom, Ireland, Canada, Australia, New Zealand, and some Caribbean countries;
• the US gallon (US gal), defined as Шаблон:Convert), which is used in the United States and some Latin American and Caribbean countries; and
• the US dry gallon ("usdrygal"), defined as Шаблон:Frac US bushel (exactly Шаблон:Val).

There are two pints in a quart and four quarts in a gallon. Different sizes of pints account for the different sizes of the imperial and US gallons.

The IEEE standard symbol for both US (liquid) and imperial gallon is gal, not to be confused with the gal (symbol: Gal), a CGS unit of acceleration.

Definitions

The gallon currently has one definition in the imperial system, and two definitions (liquid and dry) in the US customary system. Historically, there were many definitions and redefinitions.

English system gallons

There were a number of systems of liquid measurements in the United Kingdom prior to the 19th century.

• Winchester or corn gallon was Шаблон:Cvt (1697 Act 8 & 9 Will III c22)
  • Henry VII (Winchester) corn gallon from 1497 onwards was Шаблон:Cvt
  • Elizabeth I corn gallon from 1601 onwards was Шаблон:Cvt
  • William III corn gallon from 1697 onwards was Шаблон:Cvt
• Old English (Elizabethan) ale gallon was Шаблон:Cvt (1700 Act 11 Will III c15)
• London 'Guildhall' gallon (before 1688) was Шаблон:Cvt then
• Old English (Queen Anne) wine gallon was standardized as Шаблон:Cvt in the 1706 Act 5 Anne c27, :

Local variations included

• • Jersey gallon (from 1562 onwards) was Шаблон:Cvt
  • Guernsey gallon (17th century origins till 1917) was Шаблон:Cvt
  • Irish gallon was Шаблон:Cvt (1495 Irish Act 10 Hen VII c22 confirmed by 1736 Act Geo II c9)

Imperial gallon

Файл:Shell petrol station in the UK.jpg

A Shell petrol station selling 2* and 4* (leaded petrol) by the gallon in the UK, circa 1980

The British imperial gallon (frequently called simply "gallon") is defined as exactly 4.54609 dm³ (4.54609 litres). It is used in some Commonwealth countries, and until 1976 was defined as the volume of water at Шаблон:Cvt whose mass is Шаблон:Convert. There are four imperial quarts in a gallon, two imperial pints in a quart, and there are 20 imperial fluid ounces in an imperial pint, yielding 160 fluid ounces in an imperial gallon.

US liquid gallon

Файл:US petrol pump.jpg

A fuel station in the United States displaying fuel prices per US gallon

The US liquid gallon (frequently called simply "gallon") is legally defined as 231 cubic inches, which is exactly Шаблон:Convert. A US liquid gallon can contain about Шаблон:Convert of water at Шаблон:Cvt, and is about 16.7% less than the imperial gallon. There are four quarts in a gallon, two pints in a quart and 16 US fluid ounces in a US pint, which makes the US fluid ounce equal to Шаблон:Sfrac of a US gallon. In order to overcome the effects of expansion and contraction with temperature when using a gallon to specify a quantity of material for purposes of trade, it is common to define the temperature at which the material will occupy the specified volume. For example, the volume of petroleum products and alcoholic beverages are both referenced to Шаблон:Cvt in government regulations.

US dry gallon

Шаблон:Main Since the dry measure is one-eighth of a US Winchester bushel of Шаблон:Val cubic inches, it is equal to exactly 268.8025 cubic inches, which is Шаблон:Val. The US dry gallon is not used in commerce, and is also not listed in the relevant statute, which jumps from the dry pint to the bushel.

Worldwide usage

Файл:Gasoline unit.svg

Petrol units used in the world: Шаблон:LegendШаблон:LegendШаблон:LegendШаблон:Legend

Imperial gallon

As of 2021, the imperial gallon continues to be used as the standard petrol unit on 10 Caribbean island groups, consisting of:

• four British Overseas Territories (Anguilla, the British Virgin Islands, the Cayman Islands, and Montserrat) and
• six countries (Antigua and Barbuda, Dominica, Grenada, Saint Christopher and Nevis, Saint Lucia, and Saint Vincent and the Grenadines).

All 12 of the Caribbean islands use miles per hour for speed limits signage, and drive on the left side of the road.

The United Arab Emirates ceased selling petrol by the imperial gallon in 2010 and switched to the litre, with Guyana following suit in 2013. In 2014, Myanmar switched from the imperial gallon to the litre.

Antigua and Barbuda has proposed switching to selling petrol by litres since 2015.

In the European Union the gallon was removed from the list of legally defined primary units of measure catalogue in the EU directive 80/181/EEC for trading and official purposes, effective from 31 December 1994. Under the directive the gallon could still be used, but only as a supplementary or secondary unit.

As a result of the EU directive Ireland and the United Kingdom passed legislation to replace the gallon with the litre as a primary unit of measure in trade and in the conduct of public business, effective from 31 December 1993, and 30 September 1995 respectively. Though the gallon has ceased to be a primary unit of trade, it can still be legally used in both the UK and Ireland as a supplementary unit. However, barrels and large containers of beer, oil and other fluids are commonly measured in multiples of an imperial gallon.

Miles per imperial gallon is used as the primary fuel economy unit in the United Kingdom and as a supplementary unit in Canada on official documentation.

US liquid gallon

Other than the United States, petrol is sold by the US gallon in 13 other countries, and one US territory:

• the Caribbean countries of Dominican Republic and Haiti,
• the Central American countries of Belize, Guatemala, Honduras, and Nicaragua,
• the South American countries of Colombia, Ecuador, and Peru,
• the Pacific Ocean countries of Marshall Islands, Federated States of Micronesia, and Palau, which are associated countries of the United States,
• the African country of Liberia, a former protectorate of the United States, and
• the US territories of American Samoa, the Northern Mariana Islands, Guam, and the US Virgin Islands. Puerto Rico ceased selling petrol by the US gallon in 1980.

The latest country to cease using the gallon is El Salvador in June 2021.

The Imperial and US liquid gallon

Both the US gallon and imperial gallon are used in the Turks and Caicos Islands - to an increase in tax duties which was disguised by levying the same duty on the US gallon (3.79 L) as was previously levied on the Imperial gallon (4.55 L), and the Bahamas.

Legacy

In some parts of the Middle East, such as the United Arab Emirates and Bahrain, 18.9-litre water cooler bottles are marketed as five-gallon bottles.

Relationship to other units

Both the US liquid and imperial gallon are divided into four quarts (quarter gallons), which in turn are divided into two pints, which in turn are divided into two cups (not in customary use outside the US), which in turn are further divided into two gills. Thus, both gallons are equal to four quarts, eight pints, sixteen cups, or thirty-two gills.

The imperial gill is further divided into five fluid ounces, whereas the US gill is divided into four fluid ounces, meaning an imperial fluid ounce is Шаблон:Sfrac of an imperial pint, or Шаблон:Sfrac of an imperial gallon, while a US fluid ounce is Шаблон:Sfrac of a US pint, or Шаблон:Sfrac of a US gallon. Thus, the imperial gallon, quart, pint, cup and gill are approximately 20% larger than their US counterparts, meaning these are not interchangeable, but the imperial fluid ounce is only approximately 4% smaller than the US fluid ounce, meaning these are often used interchangeably.

Historically, a common bottle size for liquor in the US was the "fifth", i.e. one-fifth of a US gallon (or one-sixth of an imperial gallon). While spirit sales in the US were switched to metric measures in 1976, a 750 mL bottle is still sometimes known as a "fifth".

History

Файл:Bottle of milk.jpg

An American milk bottle with a volume of one US gallon

The term derives most immediately from galun, galon in Old Norman French, but the usage was common in several languages, for example Шаблон:Lang in Old French and Шаблон:Lang (bowl) in Old English. This suggests a common origin in Romance Latin, but the ultimate source of the word is unknown.

The gallon originated as the base of systems for measuring wine and beer in England. The sizes of gallon used in these two systems were different from each other: the first was based on the wine gallon (equal in size to the US gallon), and the second one either the ale gallon or the larger imperial gallon.

By the end of the 18th century, there were three definitions of the gallon in common use:

• The corn gallon, or Winchester gallon, of about Шаблон:Nowrap Шаблон:Nowrap,
• The wine gallon, or Queen Anne's gallon, which was Шаблон:Nowrap Шаблон:Nowrap, and
• The ale gallon of Шаблон:Nowrap Шаблон:Nowrap.

The corn or dry gallon is used (along with the dry quart and pint) in the United States for grain and other dry commodities. It is one-eighth of the (Winchester) bushel, originally defined as a cylindrical measure of Шаблон:Sfrac inches in diameter and 8 inches in depth, which made the dry gallon Шаблон:Nowrap. The bushel was later defined to be 2150.42 cubic inches exactly, thus making its gallon exactly Шаблон:Val (Шаблон:Val); in previous centuries, there had been a corn gallon of between 271 and 272 cubic inches.

The wine, fluid, or liquid gallon has been the standard US gallon since the early 19th century. The wine gallon, which some sources relate to the volume occupied by eight medieval merchant pounds of wine, was at one time defined as the volume of a cylinder 6 inches deep and 7 inches in diameter, i.e. Шаблон:Nowrap. It was redefined during the reign of Queen Anne in 1706 as 231 cubic inches exactly, the earlier definition with Шаблон:Pi approximated to Шаблон:Sfrac.

<math display=block> \pi r^2h \approx \frac{22}{7}\times\left ( \frac{7 ~ \mathrm{in}}{2} \right )^2\times6 ~ \mathrm{in} = 231 ~ \mathrm{in}^3.</math>

Although the wine gallon had been used for centuries for import duty purposes, there was no legal standard of it in the Exchequer, while a smaller gallon Шаблон:Nowrap was actually in use, requiring this statute; the 231 cubic inch gallon remains the US definition today.

In 1824, Britain adopted a close approximation to the ale gallon known as the imperial gallon, and abolished all other gallons in favour of it. Inspired by the kilogram-litre relationship, the imperial gallon was based on the volume of 10 pounds of distilled water weighed in air with brass weights with the barometer standing at 30 inches of mercury and at a temperature of Шаблон:Cvt.

In 1963, this definition was refined as the space occupied by 10 pounds of distilled water of density Шаблон:Val weighed in air of density Шаблон:Val against weights of density Шаблон:Nowrap (the original "brass" was refined as the densities of brass alloys vary depending on metallurgical composition), which was calculated as Шаблон:Val to ten significant figures.

The precise definition of exactly Шаблон:Val cubic decimetres (also Шаблон:Val, ≈ Шаблон:Val) came after the litre was redefined in 1964. This was adopted shortly afterwards in Canada, and adopted in 1976 in the United Kingdom.

Sizes of gallons

Historically, gallons of various sizes were used in many parts of Western Europe. In these localities, it has been replaced as the unit of capacity by the litre.

Comparison of gallons

Volume		Definition	Inverted volume (gal/cu ft)	Weight as water at Шаблон:Cvt (pounds/gal)	Cylindrical approximation
(cu in)	(dm3)				Diameter (in)	Height (in)	Volume rel. error (%)
Current gallons
231	Шаблон:Val	Statute of 5 Queen Anne (UK wine gallon, standard US gallon)	7.48	8.33	7	6	0.04
268.8025	Шаблон:Val	Winchester, statute of 13 & 14 William III (corn gallon, US dry gallon)	6.43	9.71	18.5	1	Шаблон:Val
≈ 277.4194	4.54609	Standard imperial gallon	≈ 6.23	10	Шаблон:Sfrac	11	Шаблон:Val
Historic gallons
216 (Roman unciae)	≈ 3.53961	Roman congius	8	7.8	5	11	0.01
224	≈ 3.67070	Preserved at the Guildhall, London (old UK wine gallon)	7.71	8.09	9	3.5	0.6
264.8	≈ 4.33929	Ancient Rumford quart (1228)	6.53	9.57	7.5	6	0.1
265.5	≈ 4.35077	Exchequer (Henry VII, 1497, with rim)	6.51	9.59	13	2	0.01
266.25	≈ 4.36306	Ancient Rumford (1228)
271	≈ 4.44089	Exchequer (1601, E.) (old corn gallon)	6.38	9.79	4.5	17	0.23
272	≈ 4.45728	Corn gallon (1688)
≈ 277.2026	≈ 4.54254	Statute of 12 Anne (coal gallon) = Шаблон:Sfrac corn gallons	6.23	10
≈ 277.274	≈ 4.54370	Imperial gallon, as originally determined in 1824	6.23	10
≈ 277.4195	Шаблон:Val	Imperial gallon as re-determined in 1895 and defined in 1963	≈ 6.23	10
278	≈ 4.55560	Exchequer (Henry VII, with copper rim)	6.21	10.04
278.4	≈ 4.56216	Exchequer (1601 and 1602 pints)	6.21	10.06
280	≈ 4.58838	Exchequer (1601 quart)	6.17	10.1
282	≈ 4.62115	Treasury (beer and ale gallon pre-1824)	6.13	10.2