7. Third principle 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.
At zero kelvin, the entropy of any pure body, perfectly crystallized in its stable form, is zero.
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 :
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