Reply to “Comment on ‘Analog of Planck’s formula and effective temperature in classical statistical mechanics far from equilibrium’ ”

We emphasize that the interpretation of Planck’s law under discussion, which is given within the framework of classical mechanics and is based on estimates for the exchanges of energy in models of molecular dynamics, actually makes reference to two well-separated time scales. On a very short time scale a state of metaequilibrium would be established such that the exchanges of energy with a measurement instrument would be described by a Planck-like law, while equipartition of energy would be established over a much larger time scale, as occurs, for example, in the case of glasses.