First Law of Thermodynamics Content
First Law of Thermodynamics
Let the initial volume of the system is V1 and initial internal energy is U1. Let DQP the gas is heated from |
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T1 K to T2 K. Addition of heat causes the following changes in the system: | |
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According to the first law of
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thermodynamics: |
DQ = DU+ DW
But DW = PDV Thus DQP = DU+ PDV As DV = (V2 – V1) DQP = DU+ P (V2 – V1) |
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GRAPHICAL REPRESENTATION
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Graph between P & V for an isobaric process is a straight line which is parallel to V-axis. | |