what is the fourth law of thermodynamics ?

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There is no such fourth law of thermodynamics. There are four law of thermodynamics which are - zeroth law of thermodynamics, first law, second law and third law of thermodynamics. These four laws of thermodynamics defines fundamental physical quantities such as temperature, energy and entropy that characterizes...
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There is no such fourth law of thermodynamics. There are four law of thermodynamics which are - zeroth law of thermodynamics, first law, second law and third law of thermodynamics. These four laws of thermodynamics defines fundamental physical quantities such as temperature, energy and entropy that characterizes thermodynamic system and how these quantities behaves under various circumstances. read less
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The fourth Laws - Zeroth law of thermodynamics -- If two thermodynamic systems are each in thermal equilibrium with a third, then they are in thermal equilibrium with each other. First law of thermodynamics -- Energy can neither be created nor destroyed. It can only change forms.
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The four laws of thermodynamics are: Zeroth law of thermodynamics: If two systems are in thermal equilibrium independently with a third system, they must be in thermal equilibrium with each other. This law helps define the notion of temperature.
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The entropy of a system approaches a constant value as the temperature approaches absolute zero. With the exception of non-crystalline solids (glasses) the entropy of a system at absolute zero is typically close to zero, and is equal to the logarithm of the multiplicity of the quantum ground states.
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The fourth Laws, Zeroth law of thermodynamics -- 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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