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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.


Charles A. de, French physicist, 1736-1806. See: coulomb.

cou·lomb (C, Q),

The unit of electrical charge, equal to 3 × 109 electrostatic units; the quantity of electricity delivered by a current of 1 A in 1 s equal to 1/96,485 faraday.
[CA de Coulomb, Fr. physicist, 1736-1806]
Farlex Partner Medical Dictionary © Farlex 2012


(C) (kū'lom)
The SI unit of electrical charge, equal to 3 × 109 electrostatic units; the quantity of electricity delivered by a current of 1 ampere in 1 sec; equal to 1/96,485 faraday; also used to measure radiation.
See also: roentgen
[CA de Coulomb, Fr. physicist, 1736-1806]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Fetam Klego is just one of the many natural attractions in Columbio, and like any gift from Mother Nature, we must always treat it with care and respect, and the local culture with courtesy.
Algunos anos despues, el quimico ingles William Hyde Wollaston (1776-1828) tras analizar un segundo fragmento del mineral, declaro erroneamente que el columbio era el mismo elemento que el tantalio, descubierto por el sueco Anders Gustaf Ekeberg.
Among those present in the turnover were Mayor Amirh Musali of the Municipality of Columbio, Sultan Kudarat; Rodolfo Orena, president of BUSIMA Water Users' Association; Jin Hirosawa, JICA representative; and Sylvia Mallari, DAR Undersecretary for Foreign-Assisted and Special Projects.
Raul Supiter, director of the Sultan Kudarat Provincial Police Office, said the soldiers were now in Columbio, according to a text message he had received from Senior Insp.
Samuel Garay, who were nabbed in Columbio town, Sultan Kudarat province; and PO2 Jerome Natividad, who was captured in Talakag town, Bukidnon province.
Gonzales said the firearms turned over by officials of the five towns were as follows: Columbio, eight firearms; Esperanza, 25; Isulan, 20; Lambayong, 129; President Quirino, 56; and, Tacurong City, 161 firearms.
Samuel Garay-were captured in Columbio, Sultan Kudarat while PO2 Jerome Natividad was seized in Talakag, Bukidnon.
Columbio, Sultan Kudarat - Two alleged members of the Communist New People's Army (NPA) surrendered Thursday to police authorities here.
Solaiman Calucop captured in Columbio, Sultan Kudarat on February 2;
Samuel Garay, who were nabbed in Columbio town in Sultan Kudarat province on Feb.