[填空题]
Calculate the total water vapor pressure in the air on 9:p-+ mgcom fnthe following two dhvpbs) q9j*o 0ays:
bhv) poq90 js* (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