● The transformation of water vapour into water is called condensation. ● Condensation is caused by the loss of heat. ● Condensation takes place when ◦ the temperature of the air is dropped down to dew point with its volume remaining constant. ◦ both the volume and temperature are reduced. ◦ moisture is added to the air through evaporation. ● The most favourable condition for condensation is the decrease in air temperature.