Given the dry adiabatic lapse rate of air is dtaz =-g/cp, where t = air temperature, z = elevation, cp-specific heat at constant pressure, g- gravity, compute dt/dz in °c/km if j oc.1 kg. if air temperature is 20°c and vapor pressure of air is 12.2 mb, estinate the elevation the air parcel must rise before the vapor pressure of air becomes saturated, assuming the lapse rate is 7°c/km. note l joule= 1 nm, 1 newton= 1 kg. m/sec2 c,-1004