Rudolf Clausius was a German physicist who made important contributions to thermodynamics and statistical mechanics. He was the first to apply the principle of thermodynamic equilibrium to systems at constant volume. In 1854 he published a paper in which he derived an equation that now bears his name. The Clausius-Clapeyron equation is a formula that relates the pressure, volume, and temperature of a perfect gas to their respective values at a fixed temperature and a fixed pressure, usually considered as a state of rest.
The fundamental laws of the universe which correspond to the two fundamental theorems of the mechanical theory of heat.1. The energy of the universe is constant.2. The entropy of the universe tends to a maximum.Rudolf Clausius
The algebraic sum of all the transformations occurring in a cyclical process can only be positive, or, as an extreme case, equal to noRudolf Clausius
