[填空题]
Calculate the total water vapor pressu,6 rp fdz.veu8,kl7xq re in thk e 1b89/i9xth8jfnzzxuu(+ge air on the following two days:
z8x1(i ft8nb +eguzh /x99 ujk (a) a hot summer day, with the temperature 30$^{\circ} $C and the relative humidity at 40%; Pa
(b) a cold winter day, with the temperature 5$^{\circ} $C and the relative humidity at 80%. Pa