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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012

li·ter

(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]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

li·ter

(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]
Medical Dictionary for the Dental Professions © Farlex 2012

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
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References in periodicals archive ?
* Celtic's Jos Hooiveld, left, challenges Swansea new boy Leroy Lita, who made his first appearance for the club in last night's friendly
But Lita, reviving the potent partnership he had with Kitson at Reading, turned two home defenders on the hour to fire in.
"I have been trying to bring him to the club for a couple of years so to get him on a free transfer was a great piece of business." Lita managed to retain his friendship with the Reading faithful, receiving a pre-match round of applause and a similar reaction to his wonderful second half strike.
NORWICH CITY Marshall, Omozusi, Doherty, Stefanovic, Bertrand, Croft (Bell 77,), Russell, Clingan, Hoolahan, Sibierski (Cureton 85), Lita (Lupoli 80).
The SVG was used for diagonal coronary revascularization and some segment of SVG was attached to the proximal half of LITA due to inadequate diameter of distal half of LITA.
But Reda Johnson made up for a horror miss in the first half with the 84thminute equaliser, and substitute Lita ended Charlton's three-game winning streak.
Marlon King (right) celebrates his strike with Leroy Lita, the scorer of the first goal at St Andrew's last night.
SWANSEA CITY manager Brendan Rodgers will receive a double boost today with the signings of Wayne Routledge and Leroy Lita.
A SUCCESSFUL conclusion to Leroy Lita's contract talks with Swansea will mean Tony Mowbray can begin recruiting new talent.
GORDON STRACHAN hailed Leroy Lita after the in-form striker set up his first win as Middlesbrough boss.
And the comfortable if unspectacular victory was decided by two goals of genuine quality as Tuncay engineered a neat first half opener, then Leroy Lita swivelled to seal it after the break with his first for the club.