List: Imperial units

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•  Acre

  The acre is a unit of area in a number of different systems, including the imperial and U.S. customary systems. The most commonly used acres today are the international acre and, in the United States, the survey acre. One international acre is equal to 4,046.856 422 4 m exactly. One U.S. survey acre is equal to ⁄15,499,969 m = 4,046.872 609 874 252 m approximately.

  

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•  British thermal unit

  The British thermal unit (BTU or Btu) is a traditional unit of energy equal to about 1.06 kilojoules. It is approximately the amount of energy needed to heat one pound of water one degree Fahrenheit. It is used in the power, steam generation, heating and air conditioning industries. In scientific contexts the BTU has largely been replaced by the SI unit of energy, the joule (J), though it may be used as a measure of agricultural energy production (BTU/kg).

  

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•  Furlong

  A furlong is a measure of distance in imperial units and U.S. customary units. It is equal to one-eighth of a mile, 220 yards, 660 feet, 201.168 meters, or 10 chains. Five furlongs are approximately 1 kilometer (1.00584 km to be exact).

  

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•  Fahrenheit

  Fahrenheit is the temperature scale proposed in 1724 by, and named after, the German physicist Daniel Gabriel Fahrenheit (1686–1736). Today, the temperature scale has been replaced by the Celsius scale in most countries. It is still in use in the United States and a few other nations, such as Belize.

  

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•  Gallon

  A gallon is a measure of volume of approximately four litres. Historically it has had many different definitions, but there are three definitions in current use. These are the U.S. liquid gallon (≈ 3.8 L) and the lesser used U.S. dry gallon (≈ 4.4 L) which are in use in the United States, and the Imperial (UK) gallon (≈ 4.5 L) which is in unofficial use within the United Kingdom and Ireland and is in semi-official use within Canada. The gallon, be it the Imperial or U.S.

  

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•  Hogshead

  A hogshead is a large cask of liquid (or, less often, of a food commodity). More specifically, it refers to a specified volume, measured in either Imperial units or U.S. customary units, primarily applied to alcoholic beverages such as wine, ale, or cider. A tobacco hogshead was used in American colonial times to transport and store tobacco. It was a very large wooden barrel.

  

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•  Horsepower

  Horsepower (HP) is the name of several units of measurement of power. The most common definitions equal between 735.5 to 746 watts. The horsepower is not recognized in the International System of Units (SI). The horsepower was originally defined to compare the output of steam engines with the power of draft horses. The unit was widely adopted to measure the output of piston engines, turbines, electric motors, and other machinery. The definition of the unit varied between geographical regions.

  

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•  Inch

  An inch is the name of a unit of length in a number of different systems, including Imperial units, and United States customary units. There are 36 inches in a yard and 12 inches in a foot. A corresponding unit of area is the square inch and a corresponding unit of volume is the cubic inch.

  

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•  Imperial units

  Imperial units or the imperial system is a system of units, first defined in the British Weights and Measures Act of 1824, later refined (until 1959) and reduced. The system came into official use across the British Empire. By the late 20th century most nations of the former empire had officially adopted the metric system as their main system of measurement.

  

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•  Mile

  A mile is a unit of length in a number of different systems. In contemporary English, a mile most commonly refers to the statute mile of 5,280 feet, the survey mile of 5,280 survey feet (1,609.3472 meters) or the nautical mile of 1,852 meters (6,076.12 ft). The use of statute miles as a unit of measurement is largely confined to the United States and the United Kingdom.

  

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•  Pound (mass)

  The pound or pound-mass is a unit of mass used in the imperial, United States customary and other systems of measurement. A number of different definitions have been used, the most common today being the international avoirdupois pound of exactly 0.45359237 kilograms. The unit is descended from the Roman libra (hence the abbreviation lb); the name pound is a Germanic adaptation of the Latin phrase libra pondo 'a pound weight'.

  

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•  Ton

  In the United Kingdom, the ton is a unit of measure which, when it ceased to be legal for trade in 1985, was defined in British legislation as being a weight or mass [sic] equal to 2,240 pounds (1,016 kg). In the United States and Canada, however, a ton is defined to be 2,000 pounds (907 kg).

  

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•  Teaspoon

  A teaspoon, an item of cutlery (in American English, also called flatware), is a small spoon, commonly part of a silverware (usually silver plated, German silver or now, stainless steel) place setting, suitable for stirring and sipping the contents of a cup of tea or coffee. Utilitarian versions are used for measuring. Teaspoons with longer handles, such as iced tea spoons, are commonly used also for ice cream deserts or floats.

  

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•  Tablespoon

  A tablespoon is a type of large spoon usually used for serving. A tablespoonful, an amount approximately equal to the capacity of one tablespoon, is commonly used as a measure of volume in cooking. It is abbreviated in English as T, tb, tbs, tbsp, tblsp, or tblspn. Only the tbs and tbsp abbreviations are currently formally recognized, although the tblsp abbreviation is also commonly used informally. In most countries one level tablespoon is defined as 15 ml. In Australia it is defined as 20 ml.

  

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•  United States customary units

  The United States customary system (also called American system or, more rarely, "English units") is the most commonly used system of measurement in the United States. It is similar but not identical to the British Imperial units. The U.S.

  

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•  Yard

  A yard is a unit of length in several different systems, including English units, Imperial units, and United States customary units. It is equal to 3 feet or 36 inches, although its length in SI units varied slightly from system to system. The most commonly used yard today is the international yard, which is defined to be exactly 0.9144 metre.

  

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•  Square mile

  The square mile (abbreviated as sq mi and sometimes as mi²) is an imperial and US unit of measure for an area equal to the area of a square of one statute mile. It should not be confused with miles square, which refers to the number of miles on each side squared. For instance, 20 miles square (20 × 20 miles) is equal to 400 square miles.

  

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•  Peck

  A peck is an imperial and U.S. customary unit of dry volume, equivalent in each of these systems to 2 gallons, 8 dry quarts, or 16 dry pints. Two pecks make a kenning (obsolete), and four pecks make a bushel. In Scotland, the peck was used as a dry measure until the introduction of imperial units as a result of the Weights and Measures Act of 1824.

  

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•  Pound-force

  The pound-force or simply pound is a unit of force.

  

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•  Ounce

  This article is about the unit of weight. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce (disambiguation). The ounce is a unit of weight with several definitions, the most commonly used of which are equal to approximately 28 grams. The ounce is used in a number of different systems, including various systems of mass that form part of the imperial and United States customary systems. Its size can vary from system to system.

  

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•  Miles per hour

  The mile per hour is a unit of speed, measured in Imperial units expressing the number of international miles covered per hour. It is currently the unit used for speed limits, and speeds, on roads in the United Kingdom and United States. It is also used to express the speed of delivery of a ball in various sporting events, such as cricket, tennis, and baseball at the higher levels of competition. A common abbreviation is mph or MPH.

  

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•  Foot (length)

  A foot is a non-SI unit of length, in a number of different systems, including English units, Imperial units, and United States customary units. Its size can vary from system to system, but in each is around a quarter to a third of a meter. The most commonly used foot today is the international foot. There are three feet in a yard and 12 inches in a foot.

  

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•  Cubic inch

  A cubic inch is a non-SI unit of volume, equal to the volume of a cube with sides of one inch. Cubic inches are still sometimes used as a unit of measurement (in engineering contexts, not household contexts) in the United States and Canada, although SI is continuing to gradually displace non-SI usage.

  

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•  Hand (length)

  A hand (or handbreadth) is a unit of measurement of length equal to 101.6 millimetres (4 in). It was originally based on the breadth of a male human hand, and is now standardized at 101.6 millimetres (4 in). When used to measure height, it is abbreviated "h" (for "hands") or "hh" ("hands high").

  

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•  Pint

  The pint is an English unit of volume or capacity in the imperial system and United States customary units. The imperial version is 20 imperial fluid ounces and is equivalent to about 568 ml, while the U.S. version is 16 U.S. fluid ounces and is equivalent to about 473 ml. Pints are commonly abbreviated as either “p” or “pt”.

  

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