If the air temperature stays higher than this for extended periods, the turbine blades will get weakened and may fail. For the UGA-98, we are going to assume that the Turbine Inlet Temperature is 2100K at the maximum thrust condition. The hot, high pressure air is allowed to blow out through a turbine, and then a nozzle. The turbine is forced by the air to spin at high speeds, driving the compressor and fan. This takes work out of the air, lowering its pressure and temperature.
Some engines have a propeller, instead of a fan.
However, since we don't directly pay for this step inside the engine, we don't consider it much. Thrust Thrust is calculated using Newton's Second Law of motion. So, the engine gulps in kilograms per second, moving at u a with respect to the engine. It adds kilograms of fuel per second. All of this mass blows out of the exhaust at u E meters per second.