A thermodynamic turbine in which steam is made to do work by expanding so as to create kinetic energy by acting on moving blades attached to a disc or drum.

A physical object that is intended to rotate within a fluid and to transform energy within a fluid into mechanical power.

A pump that utilizes a liquid annulus held by centrifugal force around the inside of a casing by a single rotor-impeller to compress vapour isothermically.