REN R350 Chapter Notes - Chapter 2: Surface Runoff, Vapor Pressure, Water Cycle
11 Sep 2017
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Chapter 2: the hydrologic cycle and the water budget pg 30-34, 37-38. The drier the air, the greater the difference between the vapor pressure of the air and its saturation vapor pressure (air in unsaturated atmosphere will be less). this difference affects the rate and amount of evaporation. Atmospheric pressure decreases with height: rising parcel of air will expand and temperature of the air will decrease, a descending parcel of air will become compressed and warmed. Pv = nrt: p= pressure (pa, v= volume (m3, n= number of moles of gas, r= universal/idea gas constant 8. 1314j/k/mol, t= air temperature (k) Adiabatic: if no heat is gained or lost in parcel of rising/falling air by mixing with surrounding air. Dry adiabatic lapse rate: the rate unsaturated air cools by adiabatic lifting. Inversion: reverse of the lapse rate when large cold air masses underlie less- dense warm air.
