A gas turbine, also known as a combustion turbine, is a type of internal combustion engine that converts chemical energy from fuel (generally a variety of gases, such as natural gas, process gas, low-Btu coal gas, and others) into mechanical energy through the process of combustion. Gas turbines are commonly used in different applications, including power generation, aviation, and industrial processes. They operate on the principle of continuous combustion, where fuel (gas) and air are continuously mixed and burned to produce a high-speed and high-energy exhaust gas stream.