Vapour Pressure

Property which describes a substances tendency to evaporate at a given temperature. It increases with increasing temperature. The higher the vapour pressure, the easier a substance can form vapours. Examples (at 20°C): Ethyl ether 58,5 kPa, Water 2,3 kPa, Mustard gas 0,015 kPa. (kPa = Kilopascal)