TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
RPHOT [1 record]
Record 1 - internal organization data 2023-05-16
Record 1, English
Record 1, Subject field(s)
- Scientific Measurements and Analyses
- Electromagnetic Radiation
- Optical Glass
- Optics
Universal entry(ies) Record 1
Record 1, Main entry term, English
- photochromic range-quotient
1, record 1, English, photochromic%20range%2Dquotient
correct, standardized
Record 1, Abbreviations, English
Record 1, Synonyms, English
Record 1, Textual support, English
Record number: 1, Textual support number: 1 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. 1, record 1, English, - photochromic%20range%2Dquotient
Record number: 1, Textual support number: 1 OBS
In the definition, the term "tau" must be replaced by the corresponding small, italicized Greek letter. 2, record 1, English, - photochromic%20range%2Dquotient
Record number: 1, Textual support number: 2 OBS
RPhot : The symbol' s capital letter "R" is italicized, and the abbreviation "Phot" is written in subscript(RPhot). 2, record 1, English, - photochromic%20range%2Dquotient
Record number: 1, Textual support number: 3 OBS
photochromic range-quotient; RPhot: term, symbol and definition standardized by the International Organization for Standardization (ISO). 3, record 1, English, - photochromic%20range%2Dquotient
Record 1, French
Record 1, Domaine(s)
- Mesures et analyse (Sciences)
- Rayonnements électromagnétiques
- Verres d'optique
- Optique
Entrée(s) universelle(s) Record 1
Record 1, Main entry term, French
- rapport d'efficacité photochromique
1, record 1, French, rapport%20d%27efficacit%C3%A9%20photochromique
correct, masculine noun, standardized
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 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. 1, record 1, French, - rapport%20d%27efficacit%C3%A9%20photochromique
Record number: 1, Textual support number: 1 OBS
Dans la définition, le terme «tau» doit être remplacé par la lettre minuscule grecque correspondante écrite en italique. 2, record 1, French, - rapport%20d%27efficacit%C3%A9%20photochromique
Record number: 1, Textual support number: 2 OBS
RPhot : Dans le symbole, la lettre majuscule «R» est écrite en italique, et l'abréviation «Phot» est écrite en indice (RPhot). 2, record 1, French, - rapport%20d%27efficacit%C3%A9%20photochromique
Record number: 1, Textual support number: 3 OBS
rapport d'efficacité photochromique; RPhot : terme, symbole et définition normalisés par l'Organisation internationale de normalisation (ISO). 3, record 1, French, - rapport%20d%27efficacit%C3%A9%20photochromique
Record 1, Spanish
Record 1, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2025
TERMIUM Plus®, the Government of Canada's terminology and linguistic data bank
A product of the Translation Bureau
Features
Language Portal of Canada

Access a collection of Canadian resources on all aspects of English and French, including quizzes.
Writing tools

The Language Portal’s writing tools have a new look! Easy to consult, they give you access to a wealth of information that will help you write better in English and French.
Glossaries and vocabularies

Access Translation Bureau glossaries and vocabularies.
- Date Modified: