Why does warm air hold more water vapour than cold air?
This is not true. Air can not “hold” water vapor, whether it is warm or cold. This common answer found in many science and meteorology text books is wrong. What is happening is when you increase the temperature, you will increase the rate of evaporation (liquid changing to a gas phase). At the same time, the heating of the air will decrease the rate of condensation (gas changing to a liquid phase). Therefore, at colder temperatures, you will have more water existing in a liquid phase than in a gas phase. For details, see link below…
