Application of First Law of Thermodynamics

Physics Doubts

ABOUT FIRST LAW OF THERMODYNAMICS

Consider a system that consists of a gas enclosed by a piston in a cylinder. Suppose the system is taken quasistatically from an initial state Pi, Vi, Ti to a final state Pf, Vf, Tf. At each step the work done and heat exchanged are measured. We know that both the total work done W and the total heat transfer Q to or from the system depend on the thermodynamic path. However, the difference Q – W, is the same for all paths between the given initial and final equilibrium states, and it is equal to the change in internal energy DELTA U of the system. 
U = Q – W 
In  the above statement, Q is positive when heat enters the system and W is positive when work is done by the system on its surroundings. 
 

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

Application of First Law of Thermodynamics

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