Introduction - Thermal Radiation Rules

•  Stefan-Boltzmann Law:    Intensity = sT ⁴
  where  s = 5.67 x 10^-8  W·m^-2·K^-4 and intensity is emitted power per square metre,  T in kelvin
   
• Wien’s Law   Wavelength of maximum intensity l _max » 2,900,000/T  nm, with T in kelvin
   

Thermal radiation rules are illustrated by this diagram;