Third law of thermodynamics, introduced in the late 19th century, is a fundamental concept in thermodynamics and statistical mechanics. This establishes a theoretical limit for absolute zero temperature, the lowest possible temperature where the particles undergo minimal vibrational motion. Third Law Of Thermodynamics What is the Third Law of Thermodynamics? The third law of thermodynamics states that the entropy of a perfect crys. al at a temperature of zero Kelvin (absolute zero) is equal to zero. Entropy, denoted by. The third law of thermodynamics states that the entropy of a closed system at thermodynamic equilibrium approaches a constant value when its temperature approaches absolute zero. Nonetheless, the combination of these two ideals constitutes the basis for the third law of thermodynamics: the entropy of any perfectly ordered, crystalline substance at absolute zero is zero. The entropy of a pure, perfect crystalline substance at 0 K is zero.
