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Kelvin - Planck's And Clausius Statement Of Second law of Thermodynamics

 The Kelvin - Planck statement of  the Second law of Thermodynamics states : 

 It is impossible for a heat engine to produce net work in a complete cycle if it exchanges heat only with  bodies at a single fixed temperature. 

 



Clausius Statement of  the second law gives : 

It is impossible to construct a device which, operating in a cycle, will produce no effect other than the transfer of  heat from a cooler to a hotter body. 

Heat cannot flow itself from a body at a lower temperature to a body at a higher temperature. Some work must be expended to achieve this.  

 

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