n.
A unit of illumination equal to one lumen per square centimeter.
[Greek phōs, phōt-, light.]
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phot
n.
A unit of illumination equal to one lumen per square centimeter.
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phot |
[Etymology: Gk: ‘light’] illuminance Symbol ph. Metric-c.g.s. 1921 Identically candela·steradian per square centimetre
[Moon P. J. Opt. Soc. Amer. Vol. 32, 348-62 (1942)] (cd·sr·cm-2 = 104lx). The milliphot (mph) was more common than the phot.
Oxford Dictionary of Biochemistry:
phot |
the cgs unit of illuminance, equal to one lumen per square centimetre; 1 phot = 104 lux.
| phosphovitin, phosphotyrosine antibodies, phosphotyrosine | |
| phot+, photagogikon, photic |
Wikipedia on Answers.com:
Phot |
For the 9th-century theologian and scholar, see Patriarch Photius I of Constantinople.
A phot (ph) is a photometric unit of illuminance, or luminous flux through an area. It is not an SI unit, but rather is associated with the older centimetre gram second system of units. The name was coined by André Blondel in 1921.[1]
Metric equivalence:
Metric dimensions:
- illuminance = luminous intensity × solid angle / length2
See also
References
- ^ Parry Moon. "System of photometer concepts", in the Journal of the Optical Society of America, volume 32, number 6 (June 1942). – Page 355: "The lumen was proposed by Blondel in 1894 and is now universally accepted. The names, phot and stilb were likewise coined by Blondel (1921) and are in general use on the Continent."
- Knowledgedoor, LLC (2005). Library of Units and Constants: Illuminance Quantity. Retrieved 2006-07-21.
- Illuminance Converter. Retrieved 2006-07-21.
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
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Copyrights:
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 | American Heritage Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Oxford Dictionary of Units & Measures. A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved. Read more |
|
Oxford Dictionary of Biochemistry. Oxford University Press. Oxford Dictionary of Biochemistry and Molecular Biology © 1997, 2000, 2006 All rights reserved. Read more | |
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| Wikipedia on Answers.com. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article Phot. Read more |
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