In physics,<unk> is a measure of the time-averaged energy flux. The word<unk> " here is not synonymous with "strength", "amplitude", or "level", as it sometimes is in colloquial speech.  For example, "the<unk> of pressure" is meaningless, since the parameters of those variables do not match.
To find the<unk>  take the energy density (that is, the energy per unit volume) and multiply it by the velocity at which the energy is moving. The resulting vector has the units of power divided by area (i.e. watt/m²). It is possible to define the<unk> of the water coming from a garden sprinkler, but<unk> is used most frequently with waves (i.e. sound or light).
Intensity 
Density
Concentration
Fluency
Saturation 
Extraction ratio
Angular resolution
Average