seawater. To increase efficiency, it is necessary to use very large magnetic fields which, in turn, require cryogenically cooled
magnets (or superconducting magnets) with all the associated cooling equipment, weight, and energy.
The same method can be used for pumping molten metals and, in particular, molten sodium as used in some nuclear
power plants. Since these metals have high conductivities, it is a very efficient method in particular since it acts as a pump
without moving parts. In the movement of corrosive materials, or molten metals at high temperatures, this is an overriding
requirement.