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WHAT IS THE FIRST LAW OF THERMODYNAMICS ?

FIRST LAW OF THERMODYNAMIC ENCOURAGED BY -

                                                               "the law of conservation of energy".

which have its own importance but when we go deep further in thermodynamics we confronts the prodigious truth that work and heat are not energy .


                                                               "they are the media by which you can transfer The Energy ".

FOR COMPLETE PROCESS OR FOR CYCLE -

heat as input for a system completely transfer's into work or vice-versa. 


 - this abbreviated as


            

SYSTEM-A


                     J (ΣQ)cycle = (ΣW)cycle
where J is the mechanical equivalent of work , and this work and heat remains conserved in thermodynamics system .


                                           "algebraic sum of WORK (W) and HEAT (Q) will be zero " .

FOR INCOMPLETE PROCESS OR FOR CHANGE OF STATE -

when input heat or work is not fully converted into its corresponding form .


than the input conserved into the system in the form of energy represented by ΔE .

 

SYSTEM-B


 




its your will to take sign convention's as per your choice throughout the process but make sure you are using them correctly during mathematical operation's .

                


              Here we are taking input as +ve & output as -ve ,


          So the mathematical expression will be ,

 

                         " Q - W = ΔE "


         "This is the first law of thermodynamic" .






 

 
  




 




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