Relativistic Thermodynamics and the Classical Model of the Electron

Lavenda, B.H. (2001) Relativistic Thermodynamics and the Classical Model of the Electron.

Abstract

Einstein's famous relation between mass and energy is
interpreted in terms of the equivalence of the rate of
heating of a body and the rate of increase of its inertial
mass. In an adiabatic process, where the proper mass
remains constant, it is the heat content, and not the
energy, which is conserved because the pressure,
and not the volume, is Lorentz-invariant. There are two
categories of relativistic quantities: inertial and
thermodynamic ones, which are transformed into one another by
the work necessary to keep the inertial state in motion.
In a non-adiabatic process, the rate of heating is
Lorentz-invariant, which must always be greater than the
power that it generates.