TERMIUM Plus®
The Government of Canada’s terminology and linguistic data bank.
COEFFICIENT HAZE UNIT [1 record]
Record 1 - internal organization data 2004-02-16
Record 1, English
Record 1, Subject field(s)
- Metrology and Units of Measure
- Environmental Studies and Analyses
- Air Pollution
Record 1, Main entry term, English
- COH unit
1, record 1, English, COH%20unit
correct
Record 1, Abbreviations, English
Record 1, Synonyms, English
- coefficient of haze unit 2, record 1, English, coefficient%20of%20haze%20unit
correct
Record 1, Textual support, English
Record number: 1, Textual support number: 1 DEF
A measure of light absorption by particles, defined as that quantity of light scattering solids producing an optical density of 0.1. 3, record 1, English, - COH%20unit
Record number: 1, Textual support number: 1 CONT
coefficient of haze (COH) (in atmospheric chemistry): One technique of measurement of the amount of filterable particulate matter suspended in air which has been used in the past depends upon drawing a measured sample of air (usually 1 000 linear feet) through a paper or membrane filter. A measurement is made of the intensity of light transmitted through the dust spot formed relative to that transmitted through an identical clean filter. The dirtiness of the air is reported in terms of the COH unit. This relates to the quantity of particulate material which produces an optical density, lg (I 0 /I) of 0.01 when measured by light transmission at 400 nm and relative to the transmission of an identical dust-free filter taken as 100%. Thus a filter which transmitted 50% relative to the clean filter has an absorbance of 0.301 or 30.1 COH units. This is not a recommended measure of filterable particulate matter since the size, colour and other properties of the aerosol and the air in which it is suspended affect the results. [Source: IUPAC Compendium of Chemical Terminology, 2nd Edition (1997).] 4, record 1, English, - COH%20unit
Record 1, French
Record 1, Domaine(s)
- Unités de mesure et métrologie
- Études et analyses environnementales
- Pollution de l'air
Record 1, Main entry term, French
- unité COH
1, record 1, French, unit%C3%A9%20COH
correct, feminine noun
Record 1, Abbreviations, French
Record 1, Synonyms, French
Record 1, Textual support, French
Record number: 1, Textual support number: 1 CONT
Certains paliers de gouvernement utilisent des sous-indices de visibilité et de particules inhalables à partir de mesures de la visibilité de 1 h et de 2 h en unités COH. Le Comité considère que cette méthode n'est pas aussi fiable que les mesures des concentrations en temps réel de particules inhalables. 1, record 1, French, - unit%C3%A9%20COH
Record number: 1, Textual support number: 1 OBS
Le COH («coefficient of haze unit») est le coefficient de transmission ou l'indice d'opacité (quantité de matières solides donnant une densité optique de 0,0l). 1, record 1, French, - unit%C3%A9%20COH
Record 1, Spanish
Record 1, Textual support, Spanish
Copyright notice for the TERMIUM Plus® data bank
© Public Services and Procurement Canada, 2024
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: