A Power Law in statistics is a relationship between quantities where one is proportional to the power of the other. Often such relations only hold over a given range. Template:
Subtypes include "square law" and "inverse-square law". Some physics examples:
A Power Law Spectrum is a spectrum such that the Flux at each Frequency (or energy as per the energy-per-Photon) is related to that frequency by a power law. A spectrum may be classified as basically power law, as opposed to, for example, a Black-Body Spectrum. Cosmic Rays' spectrum is basically power law.