  A realistic and objective axiomatic formulation of Thermostatics for
composite systems is presented. The main feature of our axiomatics is that it
is free of empirical definitions. In particular, the basic concepts of the
theory, such as those of entropy, heat and temperature, are characterized only
by the axiomatic basis and the theorems derived from it. We also show that the
concept of (quasi)static process does not belong to the body of Thermostatics.
