Flux density

The flux density is a vector field which describes the amount of physical quantity is passed through it per surface element by means of a sample surface. The total amount is referred to as flow, this results in:

If the surface is oriented perpendicularly to the flow direction, the following applies:

This is a parallel to or perpendicular to the surface unit vector.

In English, in addition to flux density is also the name fluence rate ( " fluence " ) are common.

Examples

  • The density of the flowing material is denoted by (Greek rho), with the flow velocity in the volume element. Then

Called flux density ( the mass flow ). Other examples are

  • Electric flux density of the electrical field
  • Magnetic flux density of the magnetic field
  • (Also called radiation intensity, luminous flux density, light intensity) radiant flux density of radiation or light
340485
de