In 2013 the UK National Physical Laboratory used microwave and acoustic resonance measurements to determine the speed of sound of a monatomic gas in a triaxial ellipsoid chamber to determine a more accurate value for the constant as a part of the revision of the International System of Units.
where the inverse absolute temperature in units of (Temperature times the Boltzmann constant )-1 .
Any incoming power to a black body is radiated as heat according to the Stefan–Boltzmann law, where P is the incoming power, σ is the Stefan–Boltzmann constant, A is the surface area of the black body, and T is the equilibrium temperature.
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