The temperature of a saturated parcel of air,which is made to rise ,falls at a rate of 5 degree per km of ascent i.e the adiabethc lapse rate of a saturated parcel of air or saturated adiabetic lapse rate(SALR) is about 5 degree per km .
Salr is less than dalr because ,as the saturated air is cooled its capicity to hold water vapour decreases and the excess moisture condenses into water droplets.this condensation releases latent heat that warms up the parcel of air therefore ,falls only by about 5 degree per km instead of 10 km .SALR is slightly variable -less at the equator and more at poles.
No comments:
Post a Comment