Discussion
A cloud condensation nucleus is best defined as an aerosol particle that
Answer: A
Correct answer: activates into a cloud droplet at atmospheric supersaturations
The definition is functional rather than compositional: a particle counts as a condensation nucleus if it can be activated at the fraction of one per cent supersaturation a real cloud actually reaches. Ice nucleating particles are a separate and much rarer population, and scattering sunlight or persisting in the atmosphere are properties of aerosols generally rather than tests of nucleating ability.
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