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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.


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]


/cou·lomb/ (C) (koo´lom) the SI unit of electric charge, defined as the quantity of electric charge transferred across a surface by 1 ampere in 1 second.

coulomb (C)

Etymology: Charles A. de Coulomb, French physicist, 1736-1806
the SI unit of electricity equal to the quantity of charge transferred in 1 second across a conductor in which there is a constant current of 1 ampere, or 1 ampere-second.


(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]


1. the unit of electrical charge, defined as the quantity of electrical charge transferred by 1 ampere in 1 second. Symbol C.
2. the SI unit of exposure to radiation. 1 coulomb per kilogram = 3876 roentgen; abbreviated C/kg.
References in periodicals archive ?
El nombre de columbio con el simbolo Cb permanecio en uso en las revistas norteamericanas hasta 1953, mientras que en Europa se utilizaba niobio, para poner fin a esta confusion, la decimo quinta sesion de la Union de Quimica celebrada en Amsterdam en 1949 eligio el nombre de niobio.
Garay and Calocop were on board a motorbike heading to a detachment in Columbio, Sultan Kudarat when abducted by NPA rebels on February 1, hours after the communist movement declared it was cancelling its unilateral ceasefire with the government 10 days after.
Samuel Garay of the Army's 39th Infantry Battalion based in Barangay Telefas in Columbio town.
Classes also did not start in a lumad school in Columbio, Sultan Kudarat, seven schools in Surigao del Sur, 13 schools of the Tribal Filipino Program of Surigao del Sur (TRIFPPS) and two more schools operated by the Alternative Learning Center for Agricultural and Livelihood Development (Alcadev).
At least 10 towns - President Quirino, Bagumbayan, Isulan, Senator Ninoy Aquino, Columbio, Lebak, Kalamansig and Palimbang in Sultan Kudarat, and Glan and Kiamba in Sarangani, have been declared by the Commission on Elections as areas of concern.
In 1993, farmers from drought-stricken communities took 3,000 sacks of rice from an NFA warehouse in Columbio, Sultan Kudarat.
Lariba shared that at least three trucks carrying farmers from the town of Columbio in Sultan Kudarat who were on their way to the protest in Koronadal City were held by government soldiers.
Areas that benefitted from the cloud-seeding were Malungon in Sarangani; Kidapawan and Matalam in North Cotabato; Columbio in Sultan Kudarat; Sulop, Sta.
Ronnie Dillera, Tulunan police chief, said at least 30 armed men suspected to be Moro rebels descended on Sitio Saban in Barangay Maybula, which has been serving as the town's border with nearby Columbio, Sultan Kudarat and harassed villagers tilling their farms around 11 a.
The bulletriddled bodies of tricycle drivers Manuel Rafael, 32, of Barangay San Emmanuel here; Felix Rodrigo of Apiladi Subdivision, also in this city; Rhea Ramirez, 28, of Dadiangas West, General Santos City; and Joan Mamon, 26, of Columbio, Sultan Kudarat, were later recovered.
In 1980 he was assigned to Kidapawan as mission administrator in the parish of Columbio, a tripeople setting of Christians, Muslims and indigenous tribes.