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AVERAGE MASS DIAMETER [1 record]

Record 1 1991-05-13

English

Subject field(s)
  • Air Pollution
  • Metrology and Units of Measure
  • Climatology
DEF

The median measurement of particle size for samples of particulate matter related to diameter size and thus mass.

CONT

The term mass median diameter (MMD) is sometimes used to describe aerodynamically equivalent spheres having an assigned density of 1.00 g/cm3 at a 50% mass collection efficiency, as determined in samplers with spherical aerosol particles having a known, uniform size. ... The determination of MMD is accomplished by plotting the log of particle size as a function of the percentage of particles smaller than the given size.

French

Domaine(s)
  • Pollution de l'air
  • Unités de mesure et métrologie
  • Climatologie
CONT

La concentration numérique de l'aérosol en régime stabilisé mesurée par l'AEA est très élevée (...) Le diamètre moyen massique en régime "cycle" (mesuré par le SDI) est compris entre 0,25 et 0,3 [micromètre] avec une fraction non négligeable de particules supermicroniques.

Spanish

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