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