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ZERO CALIBRATION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-02-22

English

Subject field(s)
  • Atmospheric Physics
  • Air Pollution
DEF

Air (relatively) devoid of solid, liquid or gaseous pollutant materials.

CONT

The composition of air is variable with respect to several of its components(e. g., CH4, CO2, H2O) so "pure" air has no precise meaning; it is commonly considered to be air which is free of dust, [hydrometeors, ] aerosols, and reactive gaseous contaminants of anthropogenic origin [such as industrial effluents].... Relative clean air which is free of most reactive anthropogenic pollution(NO, NO2, SO2, non-methane hydrocarbons, etc.), often used as a reference sample in the calibration and operation of instruments, is purchased under the designation of zero air.

CONT

[The] so-called "pure" air is a mixture of gases containing about 78 percent nitrogen; 21 percent oxygen; less than 1 percent of carbon dioxide, argon, and other inert gases; and varying amounts of water vapor.

OBS

air: The mixture of gases comprising the earth’s atmosphere.

French

Domaine(s)
  • Physique de l'atmosphère
  • Pollution de l'air
DEF

Air (relativement) exempt de matières polluantes solides, liquides ou gazeuses.

CONT

L'air est un mélange de gaz constituant l'atmosphère qui entoure la terre. L'air pur est composé de 21 % d'oxygène et de 78 % d'azote par volume, en plus de quantités infimes d'autres gaz comme l'argon, le gaz carbonique et la vapeur d'eau.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
  • Contaminación del aire
DEF

Aire (relativamente) exento de materiales contaminantes sólidos, líquidos o gaseosos.

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Record 2 2010-12-10

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Geological Research and Exploration
DEF

Error due to the fact that the zero position on a calibration curve may, without affecting the shape of the curve, be unstable and sensitive to external influences such as temperature, time, etc.

OBS

zero error: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Recherches et prospections géologiques
DEF

Erreur due au fait que le zéro de la courbe d'étalonnage peut, sans influencer la forme de celle-ci, posséder une place instable dont la position est sensible aux facteurs extérieurs : température, temps, etc.

OBS

erreur de zéro : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

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