On a warm summer day, a large mass of air (atmospheric pressure 1.01 X 105 Pa) is heated by the ground to a temperature of 26.0oC and then begins to rise through the cooler surrounding air. (This can he treated approximately as an adiabatic process; why'?) Calculate the temperature of the air mass when it has risen to a level at which atmospheric pressure is only 0.850 X 105 Pa. Assume that air is an ideal gas, with y = 1.40. (This rate of cooling for dry. rising air, corresponding to roughly 1oC per 100 m of altitude, is called the dry adiabatic lapse rate.)