TERMIUM Plus®

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AITKEN NUCLEUS COUNTER [3 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2000-02-08

English

Subject field(s)
  • Air Pollution
  • Pollutants
DEF

Microscopic atmospheric particle(diameter less than about 4 X 10-4 mm) which acts as a condensation nucleus in the operation of the Aitken dust counter.

French

Domaine(s)
  • Pollution de l'air
  • Agents de pollution
DEF

Particule microscopique (de diamètre inférieur à environ 4 X 10-4 mm) de l'atmosphère agissant comme noyau de condensation dans l'utilisation du pulvimètre d'Aitken.

CONT

Les particules inframicroscopiques. Elles constituent le plus petit élément des «aérosols» atmosphériques. Leur taille peut descendre au-dessous de 10 [Angstroms]. On les dénomme souvent particules (ou noyaux) d'Aitken. Leur diamètre moyen est à peine de 300 [Angstroms].

Spanish

Campo(s) temático(s)
  • Contaminación del aire
  • Agentes contaminantes
DEF

Partícula atmosférica microscópica (con diámetro inferior a 4 x 10-4 mm) que, en un contador de Aitken, actúa como núcleo de condensación.

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Record 2 1991-06-18

English

Subject field(s)
  • Air Pollution
  • Pollutants
  • Climatology
DEF

An instrument developed by John Aitken for determining the dust content of the atmosphere. In operation, a sample of air is mixed, in an expandable chamber, with a larger volume of dust-free air containing water vapor. Upon a sudden expansion, the chamber cools adiabatically below its dewpoint, and droplets form with the dust particles as nuclei (Aitken nuclei). A portion of these droplets settle on a ruled plate in the instrument and are counted with the aid of a microscope.

French

Domaine(s)
  • Pollution de l'air
  • Agents de pollution
  • Climatologie
OBS

"Pulvimètre" n'est pas attesté dans les dictionnaires généraux mais on l'utilise couramment dans les documents techniques.

Spanish

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Record 3 1991-02-18

English

Subject field(s)
  • Atmospheric Physics
CONT

A condensation nucleus counter... gives the concentration of Aitken particles in the air. Aitken particles are defined as particles in the diameter range 0. 005-0. 5 [micrometers]. This size range contains more than 99 percent of the total number of atmospheric particles. There is a well-known statistical scatter of CNC concentrations....

French

Domaine(s)
  • Physique de l'atmosphère
CONT

On les appelle noyaux de condensation (parfois, noyaux d'AITKEN), et G. MADELAINE donne le principe de leur mesure (C.N.C.) dans son article. Le tableau 3 indique leur concentration dans certaines conditions. Ils constituent un très bon indicateur de pollution.

Spanish

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