气分压就逐步接近水的饱和蒸气压。当降低某一温度时,p=p0, =1,湿天然气处于饱和状态。如果继续降温,将从气体中析出水滴。那个使气体在一定压力下处于饱和并将析出水滴的温度称为气体在该压力下的露点。The temperature at which the gas saturates at a certain pressure and at which the water droplets are expelled is called the dew point of the gas at that pressure.