supersaturation"1. In meteorology, the condition existing in a given portion of the atmosphere (or other space) when the relative humidity is greater than 100%, that is, ...
Supersaturation The condition which occurs in the atmosphere when the relative humidity is greater than 100%.
Assuming absolutely clean air, if water droplets have a high curvature, which is the case when they are smaller, they require relative humidities in excess of 100% (known as supersaturation) to be at an equilibrium vapor pressure.
For condensation to occur at a low degree of supersaturation, there must be an abundance of cloud condensation nuclei for water clouds, or ice nuclei for ice-crystal clouds, at temperatures substantially above -40°C.
 See also: Water, Saturation, Air, Cloud, Atmosphere
  
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