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In electrical equipment, a material designed to conduct magnetic flux easily but offer high resistance to current. In a nuclear reactor, the area in which nuclear fission takes place and heat is produced.

Related Terms


A type of fluxmeter in which a light coil of wire is suspended in a magnetic field in such a way that it can rotate; the ends of the suspended coil are connected to a search coil of known area penetrated by the magnetic flux to be measured; the flux is determined from the rotation of the suspended coil when the search coil is moved.


Thin sheets of magnetic steel or iron that are used in armature and magnetic pole cores to reduce the production of eddy currents. The laminations increase the electrical resistance of the core material.


A fundamental unit of magnetic flux, the total magnetic flux in a fluxoid in a type II superconductor, equal to h/(2e), where h is Planck's constant and e is the magnitude of the electron charge, or approxiiron, nickel, or titanium, or nonmagnetic deposits which either contain magnetic gangue minerals or are associated with magnetic structures.


The derived unit of magnetic flux density in the International System of Units; it is equal to 1 weber per square meter.


The ability of a material to conduct heat, expressed as thermal power conducted per unit temperature and thickness. Metals and other thermal 'conductors' have a large thermal conductivity. Refractories and other thermal 'insulators' have a low thermal conductivity.


A material used to prevent, dissolve, or facilitate removal of oxides and other undesirable surface substances. Also, the measure of the quantity of magnetism, taking into account the strength and extent of the magnetic field.

Functions Of Fluxes

Continuity of grain structure across a soldered or welded joint can only be obtained if the metals are brought into atomic contact, and this is not possible if the metals are coated with oxide layers, grease, corrosion products or other surface films. Mechanical cleaning can only remove the bulk of such surface films, some form of chemical cleaning being necessary to complete the cleaning operation. Fluxes perform some or all of the following functions:

They chemically clean the surfaces to be joined,

They prevent the formation of new oxide layers during the heating cycle of the joining process,

They assist the filler metal to run freely into the joint, and

They assist the "wetting" process by which surfaces alloying occurs.


A derived unit of magnetic flux in the International System of Units; it is that magnetic flux which, linking a circuit of one turn, would produce in it an electromotive force of 1 volt if it were reduced to zero at a uniform rate in 1 second.


A device in which a charge is heated directly by induction, with no magnetic core material linking the charge. Also known as coreless-type induction furnace.


  1. To heat to a high temperature without fusing, as to heat unformed ceramic materials in a kiln, or to heat ores, precipitates, concentrates, or residues so that hydrates, carbonates, or other compounds are decomposed and the volatile material is expelled. 2. To heat under oxidizing conditions.


A type of impulse tachometer in which the rotating member, consisting of a magnetic material, causes the magnetic flux threading a circuit containing a magnet and a pickup coil to rise and fall, producing pulses in the circuit which are rectified for a permanent-magnet, movable-coil instrument.

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