On the number of droplets in aerosols
  The number of droplets which may be formed with a supersaturated vapor in presence of a gas cannot exceed a number proportional to (pv-pvo)4 where pv and pvo denote at the same temperature the pressure of the supersaturated vapor-gas mixture and the pressure of the saturated vapor-gas mixture. The energy necessary to the droplet formation is also bounded by a number proportional to (pv-pvo)2 . 
Henri Gouin (MSNMGP, LMMT), Fran\c{c}oise Cubisol