The Carcel is a former French unit for measuring the
intensity of light. The unit was defined in 1860 as the intensity of a
Carcel lamp with standard burner and chimney dimensions, which burnt
colza oil
(obtained from the seed of the plant Brassica campestris) at a rate of 42 grams of colza oil per hour with a flame 40 millimeters in height.
In modern terminology one carcel equals about 9.74
candelas
The candela ( or ; symbol: cd) is the unit of luminous intensity in the International System of Units (SI). It measures luminous power per unit solid angle emitted by a light source in a particular direction. Luminous intensity is analogous to ...
.
References
See also
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Jail
A prison, also known as a jail, gaol (dated, standard English, Australian, and historically in Canada), penitentiary (American English and Canadian English), detention center (or detention centre outside the US), correction center, corre ...
, or cárcel in Spanish
Physical quantities
Units of luminous intensity
Lighting
Obsolete units of measurement
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