The phrase "nucleation rate" refers to how quickly new particles or structures are formed in a substance. It represents the speed at which tiny particles start to clump together or form a larger structure. Full definition
the homogeneous nucleation rate of drops nucleation in supersaturated vapor (Eqn. (judithcurry.com)
The fine - tuned model not only predicted nucleation rates more accurately but also predicted the increases and decreases of nucleation observed in field experiments over the course of a year, especially for measurements near forests. (sciencedaily.com)
As far as the webbly is concerned — no one is suggesting that bosons or fermions play any role in real world droplet nucleation rates in a supersaturated atmosphere. (realclimate.org)