1. A device that moves conducive liquid through a pipe by sending current through the liquid.

Used in a nuclear reactor cooling system for liquid alkali metal circulation.

2. A pump in which a conductive liquid is made to move through a pipe by sending a large current transversely through the liquid.

Such a current reacts with a magnetic field which is at right angles to the pipe and to the current flow in order to move the current-carrying liquid conductor just as a solid conductor is moved in an electric motor.