Modern Physics
Stefan-Boltzmann Law (Blackbody Form)
Total power radiated by an ideal blackbody (emissivity ε = 1) is proportional to the fourth power of temperature. For real (gray) surfaces, use the general emissivity form P = εσAT⁴.
Variables
PW
Power radiated
\sigmaW/(m²·K⁴)
Stefan-Boltzmann constant
Am²
Surface area
TK
Temperature
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Common questions
What is the Stefan-Boltzmann Law (Blackbody Form) formula?
Stefan-Boltzmann Law (Blackbody Form) is written P = σA T⁴. Total power radiated by an ideal blackbody (emissivity ε = 1) is proportional to the fourth power of temperature. For real (gray) surfaces, use the general emissivity form P = εσAT⁴. It belongs to Modern Physics, under Thermal Radiation.
What are the units in P = σA T⁴?
In SI units, P is power radiated, measured in W; \sigma is stefan-boltzmann constant, measured in W/(m²·K⁴); A is surface area, measured in m²; T is temperature, measured in K.