The partial pressure of water vapor is also called vapor pressure, 2.干球温度(Dry- bulb temperature) It is the temperature of moist air. The dry-bulb temperature of water vapor and dry air is the same. It is denoted as t' 3露点温度(Dew- point Temperature It is defined as the temperature at which condensation begins when the air is cooled at constant pressure In other words, it is the saturation temperature of water corresponding to the vapor pressure. t d=ta (pu)⚫ The partial pressure of water vapor is also called vapor pressure. 2.干球温度 (Dry-bulb temperature) It is the temperature of moist air. The dry-bulb temperature of water vapor and dry air is the same. It is denoted as ‘t’ . 3.露点温度(Dew-point Temperature) It is defined as the temperature at which condensation begins when the air is cooled at constant pressure. In other words, it is the saturation temperature of water corresponding to the vapor pressure. ( ) d sat pv t = t