coulomb

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Related to coulombic: magnetic force, Coulomb potential

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.

Coulomb

(kū-lohm),
Charles A. de, French physicist, 1736-1806. See: coulomb.

cou·lomb (C, Q),

(kū-lom'),
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]

coulomb

/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)

[ko̅o̅′lōm]
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.

cou·lomb

(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]

coulomb

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 ?
For example, under the aggressive testing conditions used in the Dahn lab, a typical lithium-ion cell used in a smartphone could have a coulombic efficiency of .
In this research study, an attempt has been made to evaluate CED behavior of the prepared coating binders (modified epoxidized cardanol-formaldehyde novolacs, MECNs) in terms of electrodeposition characteristics, such as electrodeposition yield (ED yield), coulombic yield (CY), and dry film thickness (DFT).
C] = assumed Coulombic energy coefficient of the semi-empirical mass formula a [M.
More than 90% of the protons and electrons produced by the bacteria from the oxidation of acetate were recovered as hydrogen gas with an overall coulombic efficiency (total recovery of electrons from acetate) of 60-78%.
When an electric field is applied parallel to the wall, Coulombic force is exerted on the mobile ions in the Gouy-Chapman layer and the electromigration of these ions drags the bulk fluid through viscous interaction.
The mechanisms proposed to explain the ions formation are the coulomb fission mechanism which assumes that the increased charge density, due to solvent evaporation, causes large droplets to divide into smaller and smaller droplets, which eventually consist only of single ions (16); and the ion evaporation mechanism, which assumes that the increased charge density that results from solvent evaporation eventually causes coulombic repulsion to overcome the liquid's surface tension, resulting in a release of ions from droplets surface (17).
In contrast, when we used PAMAM dendrimers with negatively charged carboxyl groups at the outer sphere, we could not detect any negatively charged oligonucleotides after the slides were washed, indicating coulombic repulsion.
The exponential represents the coulombic term that account for the electrostatic effects.
Coulombic, Van der Waals and interactive energy (e.
The existence of cationic (basic) and anionic (acidic) dyes in ink and their opposite Coulombic interactions with the capillary wall necessitated the development of two separate capillary electrophoresis methods (Egan et al.
The first term is a nuclear (Yukawa type) attractive potential and the second is the standard Coulombic repulsive term between the mother nucleus and the daughter alpha particle.