TERMIUM Plus®

The Government of Canada’s terminology and linguistic data bank.

RPHOT [1 record]

Record 1 2023-05-16

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Electromagnetic Radiation
  • Optical Glass
  • Optics
Universal entry(ies)
RPhot
symbol, see observation
DEF

The ratio of the difference between the luminous transmittance in the faded state, tauv0, and the luminous transmittance in the darkened state, tauv1, to the luminous transmittance in the faded state, tauv0.

OBS

In the definition, the term "tau" must be replaced by the corresponding small, italicized Greek letter.

OBS

RPhot: The symbol's capital letter "R" is italicized, and the abbreviation "Phot" is written in subscript (RPhot).

OBS

photochromic range-quotient; RPhot: term, symbol and definition standardized by the International Organization for Standardization (ISO).

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Rayonnements électromagnétiques
  • Verres d'optique
  • Optique
Entrée(s) universelle(s)
RPhot
symbol, see observation
DEF

Rapport de la différence entre le facteur de transmission dans le visible à l'état clair, tauv0, et le facteur de transmission dans le visible à l'état foncé, tauv1, au facteur de transmission dans le visible à l'état clair, tauv0.

OBS

Dans la définition, le terme «tau» doit être remplacé par la lettre minuscule grecque correspondante écrite en italique.

OBS

RPhot : Dans le symbole, la lettre majuscule «R» est écrite en italique, et l'abréviation «Phot» est écrite en indice (RPhot).

OBS

rapport d'efficacité photochromique; RPhot : terme, symbole et définition normalisés par l'Organisation internationale de normalisation (ISO).

Spanish

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