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・ Phostria stygichroa
・ Phostria syleptalis
・ Phostria tamsina
・ Phostria tedea
・ Phostria temira
・ Phostria tetrastictalis
・ Phostria tridentalis
・ Phostria truncatalis
・ Phostria umbrina
・ Phostria varialis
・ Phostria vitrifera
・ Phostria xanthoproctalis
・ Phostria xipharesalis
・ Phosvitin
・ Phoswich detector
Phot
・ Photedes
・ Photedes captiuncula
・ Photedes defecta
・ Photedes enervata
・ Photedes extrema
・ Photedes minima
・ Photeinos (strategos)
・ Photek
・ Photha Wattana Senee School
・ Photharam District
・ Photharam Railway Station
・ Phothecla
・ Photian schism
・ Photic sneeze reflex


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Phot : ウィキペディア英語版
Phot

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.〔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."〕
Metric equivalence:
:1\ \mathrm = 1\ \frac^2} = 10,000\ \frac^2} = 10,000\ \mathrm = 10\ \mathrm
Metric dimensions:
:illuminance = luminous intensity × solid angle / length2
== See also ==

*Illuminance
*Lumen (unit)
*Lux
*Photometry (optics)
*Light

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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