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SI units

the units of measurement generally accepted for all scientific and technical uses; together they make up the International System of Units. (See also metric system.) The abbreviation SI, from the French Système International d'Unités, is used in all languages. There are seven base SI units, defined by specified physical measurements, and two supplementary units. Units are derived for any other physical quantities by multiplication and division of the base and supplementary units. The derived units with special names are shown in the accompanying table.

SI is a coherent system. This means that units are always combined without conversion factors. The derived unit of velocity is the meter per second (m/s); the derived unit of volume is the cubic meter (m3). If you know that pressure is force per unit area, then you know that the SI unit of pressure (the pascal) is the unit of force divided by the unit of area and is therefore equal to 1 newton per square meter.

The metric prefixes can be attached to any unit in order to make a unit of a more convenient size. The symbol for the prefix is attached to the symbol for the unit, e.g., nanometer (nm) = 10−9 m. The units of mass are specified in terms of the gram, e.g., microgram (μg) = 10−9 kg.

Only one prefix is used with a unit; the use of units such as the millimicrometer is no longer acceptable. When a unit is raised to a power, the power applies to the prefix as well, e.g., a cubic millimeter (mm3) = 10−9 m3. When a prefix is used with a ratio unit, it should be in the numerator rather than in the denominator, e.g., kilometers/second (km/s) rather than meters/millisecond (m/ms). Only prefixes denoting powers of 103 are normally used. Hecto-, deka-, deci-, and centi- are usually attached only to the metric system units gram, meter, and liter.

Owing to the force of tradition, one noncoherent unit, the liter, equal to 10−3 m3, or 1 dm3, is generally accepted for use with SI. The internationally accepted abbreviation for liter is the letter l; however, this can be confused with the numeral 1, especially in typescript. For this reason, the capital letter L is also used as a symbol for liter. The lower case letter is generally used with prefixes, e.g., dl, ml, fl. The symbols for all other SI units begin with a capital letter if the unit is named after a person and with a lower case letter otherwise. The name of a unit is never capitalized.

li·ter (L, l),

(lē'tĕr), Although the SI unit of volume is the cubic meter and, by extension, the cubic centimeter (1 cm3=0.000 001 m3), the liter and its submultiples are preferred to the cubic meter and its submultiples for the expression of volumes and substance or mass concentrations in clinical chemistry. For practical purposes 1 cubic decimeter (dm3) = 1 liter (L). It recommended that capital (L) be used as the abbreviation of liter because the lowercase l can easily be misread as the numeral 1.
A measure of capacity of 1000 cubic centimeters or 1 cubic decimeter; equivalent to 1.056688 quarts (U.S., liquid).
[Fr., fr. G. litra, a pound]


/li·ter/ (L) (lēt´er) a basic unit of volume used for liquids with the SI system, equal to 1000 cubic centimeters, or 1 cubic decimeter, or to 1.0567 quarts liquid measure.

liter (L)

Etymology: Fr
a derived unit of volume equivalent to 1.057 quarts and defined as the volume occupied by a mass of 1 kg of water at standard temperature and pressure.


(L) (lē'těr)
A measure of capacity of 1000 cubic centimeters or 1 cubic decimeter; equivalent to 1.056688 quarts (U.S., liquid).
Synonym(s): litre.
[Fr., fr. G. litra, a pound]

liter (lēˑ·ter),

n a metric unit of measure defined as one cubic decimeter or the amount of volume occupied by one kilogram of pure water. It is written as L or dm3.


(L) (lē'těr)
A measure of capacity of 1000 cubic centimeters or 1 cubic decimeter; equivalent to 1.056688 quarts (U.S., liquid).
Synonym(s): litre.
[Fr., fr. G. litra, a pound]


the unit of capacity of the metric system, being equal to 1 cubic decimeter; equivalent to 1.1365 Imperial quarts (1.0567 American quarts) liquid measure. See si units. Abbreviated l (or sometimes L).

Patient discussion about liter

Q. I need a Lyme LIterate Doctor in MA Moving to MA - son has chronic Lyme

A. Hi! Where are you moving to? I'm here in Boston with early Lyme that I hope is not going chronic (the treatment I've taken so far is only suppressing it, and it comes back if I stop antibiotics).

Apparently there is a Dr. Sam Donta who works in Falmouth and Boston: 508-539-6666. But he is pretty busy.

More discussions about liter
References in periodicals archive ?
Lita will be jostling for a place with Marlon King, Nikola Zigic and Peter Lovenkrands.
SHINER Lita Hadn't hit a Premier League goal since May 2008, but on his first start for Swansea he scored one and made one.
Lita is also featured in the World Wrestling Federation's home video titled Divas in Hedonism, which currently ranks number three on Billboard's home video list for Sports and Special Interests after several weeks at number one.
Lita added: "One thing I've realised is that everyone wants to beat England, no matter what level.
The team still probably needs another clinical goalscorer in its ranks, but Lita has clearly staked his claim for a run in the side.
Sources in the north east suggested only last week that Lita - who was part of the club's pre-season trip to Slovenia - would be happy to stay in the Championship and see out the final year of his Boro contract.
Lita is expected to come into contention for Wednesday night's friendly against Celtic.
Selling Lita would reduce the wage bill and bring in some much-needed cash, finally giving the manager some room for manoeuvre in terms of player recruitment.
Lita picked it up, burst his way past two defenders before seeing his cut-back turned into his own net by Bristol defender Cisse.
James was shown a straight red for hauling down Cameron Park in the final minute and, with all their subs used, Liam Fontaine went in goal for the penalty that Lita easily converted to seal a 4-0 victory.
In this report, we presented a patient reoperated due to the failure of the LITA graft to the left anterior descending (LAD) artery and the pathologic examination of the LITA graft revealed eosinophilic periarteritis.
She's using her musical talents instead, as frontwoman of Lita and The Luchagors.