Third principle of thermodynamics
Formalism and principles of thermodynamics

It's also known as the Nernst principle.

Based on the results of experiments carried out on pure substances at low temperatures (electrochemistry, calorimetry), Nernst formulated the principle that bears his name.

The change in molar entropy of a uniform single-phase substance during an isobaric transformation that raises its temperature from T ₀ to T is calculable by : $s\left(T\right)-s\left(T_0\right)=$