. . I. 6 6 . , - . - , . , , , - , . , , . - . . ; Q. , : dS > Q/T Q – TdS <0 (6.1) (6.2) , Q = dU + pdV (6.3) (6.3) . , . 1 www.fptl.ru . (6.3) . I. 6 (6.2) dU + pdV– TdS <0 (6.4) (6.4) , . , (dU)S,V <0 (6.5) , , - , . . - - . , . (6.1) dS > 0 - : (6.6) , - . , , , - . , (6.4) : (dU– TdS)V <0 (6.7) , ( ). 2 www.fptl.ru . (6.7) . I. : d(U – TS)V, <0 (6.8) (U – TS) , - , . A=U – TS (6.8) 6 (6.9) , , , . - ). . (6.4) : dU + pdV– TdS= d(U + pV– TS) <0 (6.10) U + pV– TS - – . (6.10) G = U + pV– TS; (dG) <0 (6.11) , , , .( ). , - . !!! , - : 3 www.fptl.ru . . I. 6 (dS)V,U > 0 (dU)V,S < 0 (dA)V,T < 0 (dG)p,S < 0 (dS)V,U = 0 (dU)V,S = 0 (dA)V,T = 0 (dG)p,S = 0 , , d - . , . , , - , - . , : dG = dU + pdV+Vdp – TdS - SdT (6.12) : dG = dU + pdV- TdS (6.13) (6.13) dU = Q + W dG = Q + W + pdV- TdS Q (6.14) (6.15) , , , 4 www.fptl.ru . Q= TdS . I. 6 (6.16) W= W (6.17) (6.15) - dG = - W - pdV (6.18) , , . , - , dG < W + pdV; Q<TdS , (6.15) - dG > - W - pdV (6.19) , , - . (6.19) W , W , A=U -TS, . G = U + pV –TS, dG = dA + pdV (6.20) - dA =- W (6.21) , , , . , : 5 www.fptl.ru . . A = U – TS I. 6 (6.22) , : (max ) = dA = dU – TdS , . (6.23) TS - (TS = U – A), - , , , , . U – , TS , - . , , . . , . , . . 1. , . 2. . 3. , 4. . . : G = U + pV – TS (6.24) 6 www.fptl.ru . . I. 6 : dG = dU +pdV – TdS = dH – TdS (6.25) , G= H-T S (6.26) , . - , , - (6.26), , : . ( ) H - S, . , T S T S , , H G , H H. G T S. . - . H - TS - . . , , . . - , . - . , . H - TS . . 7 www.fptl.ru . . I. 6 ( - ). , : dU = TdS – pdV (6.27) : H = U + pV (6.28) dH = dU + pdV +Vdp = TdS – pdV +pdV + Vdp = TdS + Vdp dH = TdS + Vdp (6.29) , - , : A = -TS + U (6.30) dA = -TdS – SdT + dU = -TdS – SdT + TdS – pdV = -SdT –pdV dA= -SdT –pdV G = U +pV – TS (6.31) (6.32) dG = dU +pdV – TdS +Vdp – SdT = TdS – pdV + pdV – TdS +Vdp – SdT dG = – SdT + Vdp (6.33) 8 www.fptl.ru . . I. 6 (6.27), (6.29), (6.31), (6.33) , U, p, V, S . - H, A, G - T, . – . , . A T S A U (6.35) H (6.37) TS U G T S G ....(6.34) V TS T A T ....(6.35) V ....(6.36) p H T G T ....(6.37) p – . 9 www.fptl.ru . . I. 6 - A G U A T T H T G T ....(6.38) V ....(6.39) p , (6.34) A T S ;...... S V G T (6.36) .....(6.40) p – - , A U T S ....(6.41) G H T S ....(6.42) . 10 www.fptl.ru