Stefan Boltzmann Law

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Stefan Boltzmann Law

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One of the radiation laws which states that the amount of energy radiated per unit time from a unit surface area of an ideal black body

is proportional to the fourth power of the absolute temperature of the black body. The law is written: E = σT⁴where E is the emittance of the black

body; σ is the Stefan-Boltzmann constant; and T is the absolute temperature of the black body. Also called Stefan law. </dd>
This law was established experimentally by Stefan and was given theoretical support by thermodynamic reasoning due to Boltzmann. This law may be deduced by integrating Planck law over the entire frequency spectrum. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use