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Question

What Is The Third Law Of Thermodynamics?


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Solution

Third law of thermodynamics:

  • “The third law of thermodynamics states that the entropy of a perfectly ordered crystalline substance is zero at absolute zero of the temperature.”
  • At a temperature of zero Kelvin, the following phenomena can be observed in a closed system:
  • The system does not possess any heat.
  • All the atoms/molecules in the system are at their lowest energy points.

Significance of third law of thermodynamics:

  • “The third law provides an absolute reference point for the determination of entropy at any other temperature.”
  • A real-life example of the third law of thermodynamics is Steam/vapors of water are the gaseous forms of water at high temperatures as the molecules within steam are randomly moving, thus it will have high entropy.

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