dewpoint temperature, td, is the temperature at which the water vapor contained in a gas starts to condense when cooled.
露点温度 (t d ) 是气体中的 水蒸汽在冷却过程中开始凝结结露时的温度。
dewpoint is defined as the temperature at which a moist gas is saturated with respect to a plane surface of pure liquid water.
露点被定义为在湿气体达到饱 和状态并在平面表面产生纯液态水时的温度 p w = p ws (td)
pw is partial water vapor pressure 水蒸汽分压
• pws is water vapor ' s saturation pressure. 饱和水蒸汽压力
• td is dew point temperature 露点温度
at this state condensation and evaporation are at an equilibrium and take place at the same rate.
• proportional only to the pressure of water vapour (t n , m, a are constants) 只和水 蒸汽压力相关
• measurement sensitive to pressure changes 测量对压力变化非常敏感
dewpoint is not temperature dependent but only pressure dependent parameter.
露点是只和压力相关 , 并不和温度相关 的一个参数。