First Law of thermodynamics

 Thermodynamics first law : 

According to first law of thermodynamics, its state that the heat energy givenor taken to the system is equal to sum of internal energy and work done on system or by the system. 

It is based on conservation of energy. 

           Q   =   U + W 

Where Q  heat of system 

           U internal energy of system

          W  work done by the system or on system 

         Q   =  U + P ∆V 

       W =  P∆V 

     P  : pressure,  ∆V  : changing volume  

Case 1. 

If in cyclic process   : 

Internal energy of cyclic process is zero  

So       Q   = W  

 


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