In a cooling isobaric process of steam the dew point temperature is: The temperature at which the isobaric curve intercept the limit curve of steam-water at steam quality equal to zero; The temperature at which the isobaric curve intercept the limit curve of steam-water at steam quality equal to one; The temperature at which the isobaric curve intercept the limit curve of steam-water at seam quality equal to 0.5; I don't know