TERMIUM Plus®

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AITKEN COUNTER [1 record]

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Alphabetical list of terms

Record 1 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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