The gas turbine is an internal combustion engine differing in many respects from the standard  eciprocating model. In the first place, the process by which a gas turbine operates  nvolves steady flow; hence pistons and cylinders are eliminated. Secondly, each part of the hermodynamic cycle is carried out in a separate apparatus. The basic process involves ompression of air in a compressor, introduction of the compressed air and fuel into the combustion chamber(s), and finally expansion of the gaseous combustion products in a ower turbine.