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ISOCHORIC PROCESS
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| A thermodynamic process in which the volume of the system remains constant during the supply of heat is called an ISOCHORIC PROCESS. | ||||
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EXPLANATION
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| Consider a cylinder fitted with a frictionless piston. An ideal gas is enclosed in the cylinder.The piston is fixed at a particular position so that the volume of cylinder remains constant during the supply of heat. | ||||
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Let
DQ amount of heat is added to the system. Addition
of heat causes the following changes in the system:
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Internal energy increases from U1 to U2. Volume of
the system remains unchanged. Temperature
increases from T1 K to T2 K. Pressure
increases from P1 to P2. No work is
performed. |
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According
to the first law of thermodynamics:
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| DQ
= DU+ DW
But DW = PDV Thus DQ = DU+ PDV As DV = 0 DQ = DU+ P (0) DQ = DU |
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| This expression indicates that the heat supplied under isochoric process is consumed in increasing the internal energy of the system but no work is performed. | ||||
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GRAPHICAL
REPRESENTATION
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| Graph between P & V for an isochoric process is a straight line which is parallel to P-axis. | ||||
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