As a parcel of air rises, it cools, but at what rate??? rate of temperature change with height is called the *lapse rate*units of lapse rate are °C km ^{-1}Let's first consider an *unsaturated*parcel of airunsaturated parcels cool at a rate of 10°C km ^{-1}- this is called the*dry-adiabatic lapse rate***-->>**- What will be the parcel's
temperature be at 1 km?
**ANSWER**
QUESTION FOR THOUGHT: Suppose the air pressure outside a conventional jet airliner flying at an altitude of 10 km is 250 mb. Further, suppose the air inside the aircraft is pressurized to 1000mb. If the outside air temperature is -50 ºC, what would be the temperature of this air if brought inside the aircraft and compressed at the dry adiabatic rate to a pressure of 1000mb (assume that a pressure of 1000mb is equivalent to an altitude of 0 m). |