Question

state third law of thermodynamic and it's significance.

Answer 1

The third law of thermodynamics is sometimes stated as follows, regarding the properties of systems in thermodynamic equilibrium: The entropy of a system approaches a constant value as its temperature approaches absolute zero. ... The constant value is called the residual entropy of the system.

Answer 2

The third law of thermodynamics states that: “The entropy of any pure substance in thermodynamic equilibrium approaches zero as the temperature approaches zero”. The third law of thermodynamics is also called as Nernst law. It provides the basis for the calculation of absolute entropy of the substances.