(8.1.5)--4.7-5ExampleoftheFirstLawofTherm.pdf
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1、 Example of the First Law of Thermodynamics Quasi-static process for the ideal gas（1）The first law of thermodynamics（2）Joule law（3）state equationRTPV+specific process,ddV mUCT21mol()2miUR TTMordddV,mQvCTp Vv moles of monatomic molecular ideal gas experiences a thermodynamic process as shown in the p
2、icture.Example:VpOV02V0p02p0Find the volume range of exothermic and endothermic during the processSolve:The equation of the process can be obtained from the graph as0003pVVpp Substituting the state equation of the ideal gas into the above formula and eliminate p,we can find)(3)(02000VVVVRVpTFor any
3、infinitesimal process in this process,there isVVVRpTd3)(2d00From the first law of thermodynamics,dddV mQCTp VVpVVpd)2154(000From the above equation,we can find the volume range of exothermic and endothermic00815VVV0815VV 002815VVV0dQ0dQ0dQEndothermicExothermic,32V mCRThinkingIs the tangential point between adiabatic line and straight line the turning volume of exothermic and endothermic?VpOV02V0p02p0Thanks
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