Zeroth Law of thermodynamics state that

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  1. Two thermodynamics systems are always in thermal equilibrium with each other
  2. If two systems are in thermal equilibrium, then the third system will also be in thermal equilibrium
  3. Two systems not in thermal equilibrium with a third system will also not in thermal equilibrium with each other
  4. When two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other

Answer (Detailed Solution Below)

Option 4 : When two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other
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Concept:

Zeroth Law of thermodynamics: It states that, When a body ‘A’ is in thermal equilibrium with a body B, and also separately with a body C, then B and C will be in thermal equilibrium with each other. This is the basis of temperature measurement

  • In other words, If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other.

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Explanation:

  • Thus according to the Zeroth law of thermodynamics, When two systems are in thermal equilibrium with a third system, they are in thermal equilibrium with each other. So option 4 is correct.
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