**Category:**

Research Papers

**Sub-Category:**

Unification Theories

**Date Published:**

May 6, 2012

**Keywords:**

Thermodynamics, relativity, reversibility, irreversibility, energy, entropy, gravitation, Einstein’s mass-energy relation.

**Abstract:**

This short paper contains two sections. The first section is a brief reminder of the interpretation classically admitted for the process that consists in heating or cooling a given mass of water. The second section deals with an extended interpretation that can be suggested when the analysis is pursued a little further. The complement introduced lies on the idea that the Einstein mass-energy relation is as a necessary component of the thermodynamic theory, even for a process that seems too simple to enter the field of relativity.

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