So I was wondering why does condensation occur at the molecular level. I can understand evaporation as the external atmospheric pressure being less than the vapor pressure ( energy of the water molecules). This would help the the molecules to escape the hydrogen bonding holding them. But I can’t understand why would molecules want to attach nearby a cold surface as in condensation.
When water molecules in water vapour come in contact with cold surface, they transfer a part of their kinetic energy to the cold surface, which causes them to condense as water droplets. When humidity is high, the air is saturated with water vapour, so condensation occurs pretty easily. When the vapour concentration in air is low, there are less chances of transfer of kinetic energy to take place, thus condensation is difficult.