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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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Litre
CubeLitre.svg
One litre is the volume of a
cube with 10 cm sides
Unit information
Unit system SI derived unit
Unit of Volume
Symbol l[1] (ℓ) or L[1]
In SI base units: 1 L = 10−3 m3

The litre (SI spelling) or liter (American spelling) (SI symbols L or l,[1] commonly, but incorrectly, abbreviated as ltr) is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm3), 1,000 cubic centimetres (cm3) or 1/1,000 cubic metre. A cubic decimetre (or litre) occupies a volume of 10×10×10 centimetres (see figure) and is thus equal to one-thousandth of a cubic metre.

The original French metric system used the litre as a base unit. The word litre is derived from an older French unit, the litron, whose name came from Greek — where it was a unit of weight, not volume [2] — via Latin, and which equalled approximately 0.831 litres. The litre was also used in several subsequent versions of the metric system and is accepted for use with the SI,[3] although not an official SI unit — the SI unit of volume is the cubic metre (m3). The spelling used by the International Bureau of Weights and Measures is "litre",[3] a spelling which is shared by almost all English-speaking countries. The spelling "liter" is predominantly used in American English.[a]

One litre of liquid water has a mass of almost exactly one kilogram, because the kilogram was originally defined in 1795 as one cubic decimetre of water at the temperature of melting ice. Subsequent redefinitions of the metre and kilogram mean that this relationship is no longer exact.[4]

Definition[edit]

Maßkrüge (1-litre beer mugs) during the 2006 Oktoberfest in Germany

A litre is defined as a special name for a cubic decimetre or 10 centimetres × 10 centimetres × 10 centimetres, (1 L ≡ 1 dm3 ≡ 1000 cm3). Hence 1 L ≡ 0.001 m3 ≡ 1000 cm3, and 1 m3 (i.e. a cubic metre, which is the SI unit for volume) is exactly 1000 L.

From 1901 to 1964, the litre was defined as the volume of one kilogram of pure water at maximum density and standard pressure. The kilogram was in turn specified as the mass of a platinum/iridium cylinder held at Sèvres in France and was intended to be of the same mass as the 1 litre of water referred to above. It was subsequently discovered that the cylinder was around 28 parts per million too large and thus, during this time, a litre was about 1.000028 dm3. Additionally, the mass-volume relationship of water (as with any fluid) depends on temperature, pressure, purity and isotopic uniformity. In 1964, the definition relating the litre to mass was abandoned in favour of the current one. Although the litre is not an official SI unit, it is accepted by the CGPM (the standards body that defines the SI) for use with the SI. CGPM defines the litre and its acceptable symbols.

A litre is equal in volume to the millistere, an obsolete non-SI metric unit customarily used for dry measure.

Explanation[edit]

Litres are most commonly used for items (such as fluids and solids that can be poured) which are measured by the capacity or size of their container, whereas cubic metres (and derived units) are most commonly used for items measured either by their dimensions or their displacements. The litre is often also used in some calculated measurements, such as density (kg/L), allowing an easy comparison with the density of water.

One litre of water has a mass of almost exactly one kilogram when measured at its maximal density, which occurs at about 4 °C. Similarly: 1 millilitre of water has a mass of about 1 g; 1,000 litres of water has a mass of about 1,000 kg (1 tonne). This relationship holds because the gram was originally defined as the mass of 1 mL of water; however, this definition was abandoned in 1799 because the density of water changes with temperature and, very slightly, with pressure.

It is now known that density of water also depends on the isotopic ratios of the oxygen and hydrogen atoms in a particular sample. Modern measurements of Vienna Standard Mean Ocean Water, which is pure distilled water with an isotopic composition representative of the average of the world’s oceans, show it has a density of 0.999975 ±0.000001 kg/L at its point of maximum density (3.984 °C) under one standard atmosphere (760 torr, 101.325 kPa) of pressure.[5]

SI prefixes applied to the litre[edit]

The litre, though not an official SI unit, may be used with SI prefixes. The most commonly used derived unit is the millilitre, defined as one-thousandth of a litre, and also often referred to by the SI derived unit name "cubic centimetre". It is a commonly used measure, especially in medicine and cooking. Other units may be found in the table below, where the more often used terms are in bold. However, some authorities advise against some of them; for example, in the United States, NIST advocates using the millilitre or litre instead of the centilitre.[6]

Multiple Name Symbols Equivalent volume Submultiple Name Symbols Equivalent volume
100 L litre l (ℓ) L dm3 cubic decimetre    
101 L decalitre dal daL 101 dm3 ten cubic decimetres 10−1 L decilitre dl dL 102 cm3 hundred cubic centimetres
102 L hectolitre hl hL 102 dm3 hundred cubic decimetres 10−2 L centilitre cl cL 101 cm3 ten cubic centimetres
103 L kilolitre kl kL m3 cubic metre 10−3 L millilitre ml mL cm3 cubic centimetre
106 L megalitre Ml ML dam3 cubic decametre 10−6 L microlitre μl μL mm3 cubic millimetre
109 L gigalitre Gl GL hm3 cubic hectometre 10−9 L nanolitre nl nL 106 μm3 million cubic micrometres
1012 L teralitre Tl TL km3 cubic kilometre 10−12 L picolitre pl pL 103 μm3 thousand cubic micrometres
1015 L petalitre Pl PL 103 km3 thousand cubic kilometres 10−15 L femtolitre fl fL μm3 cubic micrometre
1018 L exalitre El EL 106 km3 million cubic kilometres 10−18 L attolitre al aL 106 nm3 million cubic nanometres
1021 L zettalitre Zl ZL Mm3 cubic megametre 10−21 L zeptolitre zl zL 103 nm3 thousand cubic nanometres
1024 L yottalitre Yl YL 103 Mm3 thousand cubic megametres 10−24 L yoctolitre yl yL nm3 cubic nanometre

Non-metric conversions[edit]

Metric
unit

Approximate value
Non-metric unit
System
Non-metric unit
Metric equivalency
1 L ≈ 0.87987699 quart Imperial 1 quart ≡ 1.1365225 L
1 L ≈ 1.056688 fluid quarts U.S. 1 fluid quart ≡ 0.946352946 L
1 L ≈ 1.75975326 pints Imperial 1 pint ≡ 0.56826125 L
1 L ≈ 2.11337641 fluid pints U.S. 1 fluid pint ≡ 0.473176473 L
1 L ≈ 0.21997 gallon Imperial 1 gallon ≡ 4.54609 L
1 L ≈ 0.2641720523 liquid gallon U.S. 1 liquid gallon ≡ 3.785411784 L
1 L ≈ 0.0353146667 cubic foot   1 cubic foot ≡ 28.316846592 L
1 L ≈ 61.023744 cubic inches   1 cubic inch ≡ 0.016387064 L
1 L ≈ 35.1950 fluid ounces Imperial 1 fluid ounce ≡ 28.4130625 mL
1 L ≈ 33.8140 customary fluid ounces U.S. 1 customary fluid ounce ≡ 29.5735295625 mL
See also Imperial units and US customary units

Rough conversions[edit]

One litre is slightly more than one U.S. liquid quart and slightly less than one imperial quart or one U.S. dry quart. A mnemonic for its volume relative to the imperial pint is ‘a litre of water is a pint and three quarters’.

A litre is the volume of a cube with sides of 10 cm, which is slightly less than a cube of sides 4 inches (or one-third of a foot). One cubic foot would contain exactly 27 such cubes (four inches on each side), making one cubic foot approximately equal to 27 litres. One cubic foot has an exact volume of 28.316846592 litres, which is within 5% of the 27-litre approximation.

A litre of water has a mass almost exactly equal to one kilogram. An early definition of the kilogram was set as the mass of one litre of water. Because volume changes with temperature and pressure, and pressure uses units of mass, the definition of a kilogram was changed. At standard pressure, one litre of water has a mass of 0.999975 kg at 4 °C, and 0.997 kg at 25 °C.[7]

Symbol[edit]

Originally, the only symbol for the litre was l (lowercase letter L), following the SI convention that only those unit symbols that abbreviate the name of a person start with a capital letter. In many English-speaking countries, however, the most common shape of a handwritten Arabic digit 1 is just a vertical stroke; that is, it lacks the upstroke added in many other cultures. Therefore, the digit "1" may easily be confused with the letter "l". Further, on some typewriters, particularly older ones, the unshifted L key had to be used to type the numeral 1. Even in some computer typefaces, the two characters are barely distinguishable. This caused some concern, especially in the medical community.

As a result, L (uppercase letter L) was adopted as an alternative symbol for litre in 1979. The United States National Institute of Standards and Technology now recommends the use of the uppercase letter L,[8] a practice that is also widely followed in Canada and Australia. In these countries, the symbol L is also used with prefixes, as in mL and μL, instead of the traditional ml and μl used in Europe. In the UK and Ireland as well as the rest of Europe, lowercase l is used with prefixes, though whole litres are often written in full (so, "750 ml" on a wine bottle, but often "1 litre" on a juice carton). In 1990, the CIPM stated that it was still too early to choose a single symbol for the litre.[citation needed]

Prior to 1979, the symbol (script small l, U+2113), came into common use in some countries; for example, it was recommended by South African Bureau of Standards publication M33 and Canada in the 1970s. This symbol can still be encountered occasionally in some English-speaking and European countries like Germany, and its use is ubiquitous in Japan and South Korea. Fonts covering the CJK characters usually include not only the script small ℓ but also four precomposed characters: ㎕, ㎖, ㎗ and (U+3395 to U+3398) for the microlitre, millilitre, decilitre and kilolitre. Such usage in printed works is in conflict with the recommendations published by the BIPM on the advice of the major international standards organisations (including ISO, NIST, NPL, IAU, IUPAC and IUPAP) who state in the SI Brochure that unit symbols should be "printed in Roman (upright) type regardless of the type used in the surrounding text".[9][10]

History[edit]

The first name of the litre was "cadil"; standards are shown at the Musée des Arts et Métiers in Paris.[11]

The litre was introduced in France in 1795 as one of the new "republican units of measurement" and defined as one cubic decimetre.[12] One litre of liquid water has a mass of almost exactly one kilogram, due to the gram being defined in 1795 as one cubic centimetre of water at the temperature of melting ice.[4] The original decimetre length was 44.344 lignes, which was revised in 1798 to 44.3296 lignes. This made the original litre 1.000974 of today's cubic decimetre. It was against this litre that the kilogram was constructed.

In 1879, the CIPM adopted the definition of the litre, with the symbol l (lowercase letter L).

In 1901, at the 3rd CGPM conference, the litre was redefined as the space occupied by 1 kg of pure water at the temperature of its maximum density (3.98 °C) under a pressure of 1 atm. This made the litre equal to about 1.000028 dm3 (earlier reference works usually put it at 1.000027 dm3).

In 1964, at the 12th CGPM conference, the original definition was reverted to, and thus the litre was once again defined in exact relation to the metre, as another name for the cubic decimetre, that is, exactly 1 dm3.[13]

In 1979, at the 16th CGPM conference, the alternative symbol L (uppercase letter L) was adopted. It also expressed a preference that in the future only one of these two symbols should be retained, but in 1990 said it was still too early to do so.[14]

Colloquial and practical usage[edit]

In spoken English, the symbol "mL" (for millilitre) is often pronounced as "mil", which is potentially confusing as this could also be interpreted as:

  1. millimetre, a unit of length equal to one-thousandth of a metre
  2. thousandth of an inch
  3. mil, a Scandinavian unit of length equal to 10 kilometres
  4. angular mil, unit of angular measurement

Generally, these various meanings do not create confusion because the context is usually sufficient—one being a volume, the others linear or angular measurement.

The abbreviation cc (for cubic centimetre, equal to a millilitre or mL) is a unit of the cgs system, that preceded the MKS system, that later evolved into the SI system. The abbreviation cc is still commonly used in many fields including medical dosage and sizing for small combustion engine displacement, such as those used in motorcycles.

The microlitre (μL) has been known in the past as the lambda (λ), but this usage is now discouraged.[15] In the medical field the microlitre is sometimes abbreviated as mcL on test results.[16]

In the SI system, use of prefixes for powers of 1,000 is preferred and all other multiples discouraged. However, in countries where the metric system was established well before the adoption of the SI standard other multiples were already established, their use remains common. In particular, use of the centi (10−2), deci (10−1), deca (10+1) and hecto (10+2) prefixes are still common. For example, in many European countries, the hectolitre is the typical unit for production and export volumes of beverages (milk, beer, soft drinks, wine, etc.) and for measuring the size of the catch and quotas for fishing boats; decilitres are common in Switzerland and Scandinavia and sometimes found in cookbooks; centilitres indicate the capacity of drinking glasses and of small bottles. In colloquial Dutch in Belgium, a "vijfentwintiger" and a "drieëndertiger" (literally "twenty-fiver" and "thirty-threer") are the common beer glasses, the corresponding bottles mention 25 cL or 33 cL. Bottles may also be 75 cL or half size at 37.5 cL for 'artisanal' brews or 70 cL for wines or spirits. Cans come in 25 cL, 33 cL and 50 cL a.k.a. 0.5 L.

In countries where the metric system was adopted as the official measuring system after the SI standard was established, common usage more closely follow contemporary SI conventions. For example, in Canada, Australia, and New Zealand, consumer beverages are labelled almost exclusively using litres and millilitres. Hectolitres sometimes appear in industry, but centilitres and decilitres are rarely, if ever, used. Larger volumes are usually given in cubic metres (equivalent to 1 kL), or thousands or millions of cubic metres.

Although kilolitres, megalitres, and gigalitres are commonly used for measuring water consumption, reservoir capacities and river flows, for larger volumes of fluids, such as annual consumption of tap water, lorry (truck) tanks, or swimming pools, the cubic metre is the general unit. It is also generally for all volumes of a non-liquid nature.

Usages to indicate capacity[edit]

Fields where the litre and millilitre are used as a measurement for non-liquid volumes, where the capacity of the container is indicated, include:

See also[edit]

Notes[edit]

  1. ^ The Metric Conversion Act of 1985 gives the United States Secretary of Commerce the responsibility of interpreting or modifying the SI for use in the United States. The Secretary of Commerce delegated this authority to the Director of the National Institute of Standards and Technology (NIST) (Turner, 2008). In 2008, the NIST published the U.S. version (Taylor and Thompson, 2008a) of the English text of the eighth edition of the Bureau International des Poids et Mesures (BIPM) publication Le Système International d' Unités (SI) (BIPM, 2006). In the NIST publication, the spellings 'meter', 'liter' and 'deka' are used rather than 'metre', 'litre' and 'deca' as in the original BIPM English text (Taylor and Thompson, 2008a, p. iii). The Director of the NIST officially recognized this publication, together with Taylor and Thompson (2008b), as the ‘legal interpretation’ of the SI for the United States (Turner, 2008).

References[edit]

  1. ^ a b c International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), p. 124, ISBN 92-822-2213-6 
  2. ^ Collins English Dictionary
  3. ^ a b Bureau International des Poids et Mesures, 2006, p. 124. ("Days" and "hours" are examples of other non-SI units that SI accepts.)
  4. ^ a b "Décret relatif aux poids et aux mesures du 18 germinal an 3 (7 avril 1795)" [Weights and measures decree dated 18 Germinal, Year 3 (7 April 1795)] (in French). Association Métrodiff. 7 April 1795. Gramme, le poids absolu d'un volume d'eau pure égal au cube de la centième partie du mètre , et à la température de la glace fondante.  English translation: ‘Gramme: the absolute weight of a volume of pure water equal to the cube of the hundredth part of the meter, at the temperature of melting ice.’
  5. ^ Isotopic composition and temperature per London South Bank University’s "List of physicochemical data concerning water", density and uncertainty per NIST Standard Reference Database Number 69 (Retrieved: 2010-04-05)
  6. ^ Kenneth Butcher, Linda Crown, Elizabeth J. Gentry (2006), The International System of Units (SI) – Conversion Factors for General Use, NIST Special Publication 1038
  7. ^ "Online water density calculator". Antoine.frostburg.edu. Retrieved 2012-04-26. 
  8. ^ Non-SI units accepted for use with the SI by the CIPMNIST
  9. ^ International Bureau of Weights and Measures (2006), The International System of Units (SI) (PDF) (8th ed.), ISBN 92-822-2213-6 
  10. ^ "Criteria for membership of a Consultative Committee". Bureau International des Poids et Mesures. Retrieved 2012-09-25. 
  11. ^ "Visite Générale au Musée des arts et métiers" (PDF). Paris: Musée des arts et métiers. Retrieved 5 August 2013. Comment s’est appelé cet étalon de mesure avant de s’appeler le litre ? - Le Cadil [What was the name of this measurement before called being called a litre? - a Cadil]. 
  12. ^ "Décret relatif aux poids et aux mesures du 18 germinal an 3 (7 avril 1795)" [Weights and measures decree dated 18 Germinal, Year 3 (7 April 1795)] (in French). Association Métrodiff. 7 April 1795. Litre, la mesure de capacité, tant pour les liquides que pour les matières sèches, dont la contenance sera celle du cube de la dixièrne partie du mètre.  English translation: ‘Litre: unit of capacity for both liquids and solids which will be equivalent to a cube of [with sides] one tenth of a metre.’
  13. ^ "NIST, 2000". Ts.nist.gov. Archived from the original on 10 December 2011. Retrieved 2012-04-26. 
  14. ^ "Bureau International des Poids et Mesures, 2006" (PDF). Retrieved 2012-04-26. 
  15. ^ Carl A. Burtis and David E. BrunsTietz (2014), Fundamentals of Clinical Chemistry and Molecular Diagnostics, 7th ed., Elsevier Health Sciences, ISBN 0323292062, p. 114.
  16. ^ "Units of Measurement - Mayo Medical Laboratories". www.mayomedicallaboratories.com. Retrieved 23 June 2017. 
  17. ^ "Buying a car: Top 10 Estate Car buying tips". Which? / Consumer Association. 2012. Retrieved 2012-11-09. 
  18. ^ [1]
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Bibliography[edit]

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