2. Formation of Cloud droplets. 2.1 General aspects. 2.2 The curvature effect. 2.3 The solute effect. 2.4 Atmospheric aerosols and CCN. 2.1 General Aspects. * Phase changes of water. vapor ---- liquid. liquid ---- solid. vapor ---- solid. * Nucleation processes.
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2.1 General aspects
2.2 The curvature effect
2.3 The solute effect
2.4 Atmospheric aerosols and CCN
* Phase changes of water
vapor ---- liquid
liquid ---- solid
vapor ---- solid
* Nucleation processes
Homogeneous: droplets form in a pure environment
Heterogeneous: droplets form on nuclei
* Supersaturation: the excess of relative humidity
over the equilibrium value of 100%
Droplet will continue to grow to cloud drop size if S remains above the curve.
The nuclei activated at supersaturations less
than a few per cent (S < 1.02) are called CCN.