An absolute scale for it was established by the Zeroth Law of Thermodynamics and it is the driving force behind heat transfer.
One named for Debye is equal to Planck's constant times the speed of sound in a medium, times the radius of a sphere, divided by the side length of a cube and Boltzmann's constant. More generally, its reciprocal is the rate of entropy increase with increases in energy, while for a system at constant volume, it is the change of internal energy with respect to entropy. An absolute scale for it was established by the Zeroth Law of Thermodynamics and it is the driving force behind heat transfer. For 10 points, identify this physical quantity which can be quantified using the Rankine, Kelvin, or Celsius scales.
One named for Debye is equal to Planck's constant times the speed of sound in a medium, times the radius of a sphere, divided by the side length of a cube and Boltzmann's constant.
{temperature}