Physics:Carcel
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Short description: Former French unit for measuring the intensity of light
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 [1] (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.[2][3]
In modern terminology one carcel equals about 9.74 candelas.[1]
See also
- Jail, or cárcel in Spanish
References
- ↑ 1.0 1.1 Rowlett, Russ. "Carcel entry". How Many? A Dictionary of Units of Measurement. University of North Carolina at Chapel Hill. http://www.unc.edu/~rowlett/units/dictC.html. Retrieved 2009-05-13.
- ↑ "Carcel definition". Webster's Revised Unabridged Dictionary, published 1913 by C. & G. Merriam Co.. The Free Dictionary. 2009. http://www.thefreedictionary.com/Carcel. Retrieved 2009-05-13.
- ↑ Johnston, S.F. (Feb 23, 2004). "History of light and color". eknigu Science library. http://www.eknigu.org/info/P_Physics/PPop_Popular-level/Johnston%20S.F.%20History%20of%20light%20and%20color%20(IOP,%202001)(292s).pdf. Retrieved 2009-05-13.
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