Image analysis software processes the raw images to determine a circular equivalent drop diameter.
2.
According to Stokes law, the settling rate increases proportionally with the square of the drop diameter.
3.
Where p _ w is the droplet water vapor pressure, p ^ 0 is the corresponding saturation vapor pressure over a flat surface, \ sigma _ w is the droplet surface tension, \ rho _ w is the density of pure water, n _ s is the moles of solute, M _ w is the molecular weight of water, and D _ p is the cloud drop diameter.