Flux density
The flux density is a vector field which describes the amount of a physical quantity that flows through a sample surface per surface element . The total amount is called the flow , so it results:
In general:
where is the angle between and the normal of the surface element and the unit vector in the direction of .
If the surface is oriented perpendicular to the flow direction, the following applies:
In addition to flux density , the term fluence rate ("fluence rate") is also used in English .
Examples
- Electric flux density of the electric field
- Magnetic flux density of the magnetic field
- Momentum current density
- Electric current density
See also
- Fluence (particles per area)
- electrical current density , dielectric
- Radiant flux density ( irradiance ), luminous flux density ( illuminance )
- Particle flux density
- Neutron flux density