Cloud Droplet Growth by Condensation

• Consider pure water in equilibrium with air above it -->
• then the RH = 100%
• evaporation = condensation
• vapor pressure (e) = saturation vapor pressure (e_s)

• if evaporation > condensation, water is ANSWER

• if evaporation < condensation, water is ANSWER

• Now, a droplet surface is not flat as shown to the right -> instead, it has curvature.....

• Q: how does curvature affect the evaporation/condensation process???