A turbine is any of various rotary machines that convert the kinetic energy in a stream of fluid (gas or liquid) into mechanical energy by passing the stream through a system of fixed and moving fans or blades. Turbines are simple but powerful machines that embody Newton's third law of motion which states that for every action there is an equal and opposite reaction. They are classified according to the driving fluid they use: steam, gas, water, and wind. Today, different types of turbines generate electricity, power ships and submarines, and propel jet aircraft.
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