According to the Stefan-Boltzmann law, the total power P P\,P emitted per unit surface area of a black body is directly proportional to the fourth power of its absolute temperature TTT. This is expressed by the equation:
P=σAT4 P = \sigma A T^4 P=σAT4where A A\,A is the surface area and σ \sigma\,σ is the Stefan-Boltzmann constant. What are the SI base units of σ\sigmaσ?
kg s−3K−4\text{kg s}^{-3}\text{K}^{-4}kg s−3K−4
kg m2s−3K−4\text{kg m}^2\text{s}^{-3}\text{K}^{-4}kg m2s−3K−4
kg s−2K−4\text{kg s}^{-2}\text{K}^{-4}kg s−2K−4
kg m s−3K−4\text{kg m s}^{-3}\text{K}^{-4}kg m s−3K−4
