| 单词 | kern counter |
| 释义 | > as lemmaskern counter kern counter n. Meteorology a device in which a sample of air is supersaturated and condensation nuclei made visible and collected for counting: originally intended to measure the concentration of condensation nuclei in the air, but now known to respond to particles too small to act as such under atmospheric conditions. ΚΠ 1941 Jrnl. Royal Aeronaut. Soc. 45 72 The Aitken nucleus or ‘kern’ counter determines the number of nuclei in an air sample by subjecting it to a rapid expansion. This causes a considerable degree of supersaturation, and the drops which form around each nucleus fall on to a ruled slide where they may be counted. 1954 J. C. Johnson Physical Meteorol. vii. 207 Dust counts made by instruments such as the Aitken kern counter have little correlation with the number of active condensation nuclei in the atmosphere. 1967 R. W. Fairbridge Encycl. Atmospheric Sci. & Astrogeol. 84/2 Such nuclei counters (or kern counters..) have some distinct advantages. < as lemmas |
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