1.

Explain how the third law of thermodynamic can be used for the evolution of absolute entropy of a substance

Answer»
  • The third law of thermodynamics states that the entropy of any perfectly ordered, crystalline substance at absolute zero is zero. 
  • At temperatures greater than absolute zero, entropy has a positive value, which allows us to measure the absolute entropy of a substance.
  • The third law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant. 

  • This is because a system at zero temperature exists in its ground state, so that its entropy is determined only by the degeneracy of the ground state



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