Division 3.3.2 Wet air United Kingdom Original text. Later amendments are not shown. This section describes how to determine the amount of water in an ideal gas: 3.3.2.1Vapour pressure of water 3.3.2.2Dew point 3.3.2.3Relative humidity 3.3.2.4Dew point determination from relative humidity and dry bulb temperature ← Division (*) Division 3.3.2 Division 3.3.2.1 →