Discussion
State whether the following is true or false.
Activation of the largest nuclei limits the supersaturation reached and so prevents smaller nuclei from activating.
Answer: B
Correct answer: True
This is the feedback that governs droplet number. As nuclei activate they grow rapidly and consume vapour, and once that consumption matches the supply from cooling the supersaturation stops rising and begins to fall. Nuclei whose critical supersaturation was never reached remain as haze. The cloud therefore selects its own droplet population, and adding more nuclei does not increase the number indefinitely.
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