大学物理(热学).ppt

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1、2023-3-11大学物理（热学）大学物理（热学） 1)Review2)Examples3)Order and Disordere= W/ QH = 1-QL/QH =1-TL/THClausius deduction (1865)QL/ TL=QH /TH, QH/ TH-QL /TL =0 (Q/T)=0 0TdQrev ?TdQrev 0TdQrevT1T2T3T4T5T6T7(Q1/ T1+Q2 /T2)+(-Q2 /T2 +Q3 /T3 )+ (-Q6 /T6 +Q7 /T7 )=0TdQdS baTdQbaTdQIII)()(0)()(abTdQbaTdQIIIIrreversib

2、le: e= W/ QH = 1-QL/QH QH /TH (Q/T) V1. Calculate the change in entropy (a) of the gas and (b) of the surrounding environment. (c) Evaluate S for 1.00 mole, with V2 = 2.00 V1.Example 20-8BAABTdQSSBAABTdQSS“Natural processes tend to move toward a state of greater disorder.”Second Law等几率假定等几率假定S=kBlnW