1. Definition of Atmospheric Air(湿空气的定义) Dry air Water vapor(moisture) EAtmospheric Air (含有水蒸汽的空气称为湿空气。) Air that contains no water vapor is called dry air. (完全不含水蒸汽的空气称为干空气。) 2. Characteristics of Moisture Air(湿空气的特点) Atmospheric air contains a very small amount of water vapor. The partial pressure of water vapor is very low so that water vapor in the atmospheric air is always at superheated state Thus water vapor can be treated as ideal gas, (湿空气中水蒸汽含量很小,分压力很低,常处于过热状态,可以当 作理想气体来处理。)1. Definition of Atmospheric Air（湿空气的定义） Dry air + Water vapor (Moisture) =Atmospheric Air (含有水蒸汽的空气称为湿空气。) Air that contains no water vapor is called dry air. (完全不含水蒸汽的空气称为干空气。) 2. Characteristics of Moisture Air (湿空气的特点) Atmospheric air contains a very small amount of water vapor. The partial pressure of water vapor is very low so that water vapor in the atmospheric air is always at superheated state. Thus, water vapor can be treated as ideal gas. (湿空气中水蒸汽含量很小，分压力很低，常处于过热状态，可以当 作理想气体来处理。)