Aitken nucleus
Aitken nucleus Suspended, atmospheric, solid particle with a radius of less than 0.2 μm. Most Aitken nuclei are about 0.5 μm. On average, their concentration varies from less than 1000/cm3 over oceans to 150 000/cm3 in urban areas. See AITKEN NUCLEI COUNTER; and NUCLEUS.
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Aitken nucleus