The third law of thermodynamics is defined as assigning an entropy equal to zero at absolute zero temperature (0 K) for any pure compound in a stable and perfectly crystalline state. This law allows for the expression of the absolute value of entropy in relation to internal energy. 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. The third law of thermodynamic states that as the temperature of a system approaches absolute zero, its entropy becomes constant, or the change in entropy is zero. The third law of thermodynamics predicts the properties of a system and the behavior of entropy in a unique environment known as absolute temperature. The third law of thermodynamics concerns the behavior of atoms and molecules at absolute zero temperature. It states that the entropy of a system is zero as the temperature approaches absolute zero. In other words, the entropy of a perfect crystal of a pure substance is zero at zero Kelvin (0 K) [1-4].
