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Principle of minimum energy

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148:(and fixed external parameters), the second law states that the entropy will increase to a maximum value at equilibrium. An isolated system has a fixed total energy and mass. A closed system, on the other hand, is a system which is connected to another, and cannot exchange matter (i.e. particles), but can transfer other forms of energy (e.g. heat), to or from the other system. If, rather than an isolated system, we have a closed system, in which the entropy rather than the energy remains constant, then it follows from the first and second laws of thermodynamics that the energy of that system will drop to a minimum value at equilibrium, transferring its energy to the other system. To restate: 29: 876:
surroundings will maximize its entropy given its newly acquired energy, which is equivalent to the energy having been transferred as heat. Since the potential energy of the system is now at a minimum with no increase in the energy due to heat of either the marble or the bowl, the total energy of the system is at a minimum. This is an application of the minimum energy principle.
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previously the potential energy of the marble, will now reside in the increased heat energy of the marble-bowl system. This will be an application of the maximum entropy principle as set forth in the principle of minimum potential energy, since due to the heating effects, the entropy has increased to the maximum value possible given the fixed energy of the system.
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that an external agent presses down on the weight so as to very slowly (reversibly) allow the weight to move upward to its equilibrium position, then there will be no heat generated and the entropy of the system will remain constant while energy is transferred as work to the external agent. The total energy of the system at any value of
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is smaller than its equilibrium value. The upward force of the gas is greater than the downward force of the weight, and if allowed to freely move, the gas in the cylinder would push the weight upward rapidly, and there would be frictional forces that would convert the energy to heat. If we specify
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of motion of the marble. Frictional forces will convert this kinetic energy to heat, and at equilibrium, the marble will be at rest at the bottom of the bowl, and the marble and the bowl will be at a slightly higher temperature. The total energy of the marble-bowl system will be unchanged. What was
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If, on the other hand, the marble is lowered very slowly to the bottom of the bowl, so slowly that no heating effects occur (i.e. reversibly), then the entropy of the marble and bowl will remain constant, and the potential energy of the marble will be transferred as energy to the surroundings. The
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The Helmholtz free energy is a useful quantity when studying thermodynamic transformations in which the temperature is held constant. Although the reduction in the number of variables is a useful simplification, the main advantage comes from the fact that the Helmholtz free energy is minimized at
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The minimization is with respect to the unconstrained variables. In the case of chemical reactions this is usually the number of particles or mole fractions, subject to the conservation of elements. At equilibrium, these will take on their equilibrium values, and the internal energy
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The first condition states that entropy is at an extremum, and the second condition states that entropy is at a maximum. Note that for the partial derivatives, all extensive parameters are assumed constant except for the variables contained in the partial derivative, but only
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and minimize with respect to this unconstrained variable. There may be any number of unconstrained variables depending on the number of atoms in the mixture. For systems with multiple sub-volumes, there may be additional volume constraints as well.
718:{\displaystyle \left({\frac {\partial U}{\partial X}}\right)_{S}=-\,{\frac {\left({\frac {\partial S}{\partial X}}\right)_{U}}{\left({\frac {\partial S}{\partial U}}\right)_{X}}}=-T\left({\frac {\partial S}{\partial X}}\right)_{U}=0} 2348: 2552: 141:, the internal energy will decrease and approach a minimum value at equilibrium. External parameters generally means the volume, but may include other parameters which are specified externally, such as a constant magnetic field. 1543: 1150:
The principle of minimum energy can be generalized to apply to constraints other than fixed entropy. For other constraints, other state functions with dimensions of energy will be minimized. These state functions are known as
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where temperature has replaced entropy as a natural variable. In order to understand the value of the thermodynamic potentials, it is necessary to view them in a different light. They may in fact be seen as (negative)
1155:. Thermodynamic potentials are at first glance just simple algebraic combinations of the energy terms in the expression for the internal energy. For a simple, multicomponent system, the internal energy may be written: 1737: 2216: 866:
Consider, for one, the familiar example of a marble on the edge of a bowl. If we consider the marble and bowl to be an isolated system, then when the marble drops, the potential energy will be converted to the
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at constant temperature and volume. This follows directly from the principle of minimum energy which states that at constant entropy, the internal energy is minimized. This can be stated as:
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which varies as a system approaches equilibrium, and that it is the only such parameter which is varying. The principle of maximum entropy may then be stated as:
2734:{\displaystyle A_{0}={\underset {x}{\mathrm {min} }}({\underset {S_{0}}{\mathrm {min} }}(U(S_{0},x)-T_{0}S_{0}))={\underset {x}{\mathrm {min} }}(A_{0}(T_{0},x))} 2227: 1410:
of the internal energy, in which certain of the extensive parameters are replaced by the derivative of internal energy with respect to that variable (i.e. the
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are the value of the internal energy and the (fixed) entropy at equilibrium. The volume and particle number variables have been replaced by
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As a concrete example of unconstrained internal variables, we might have a chemical reaction in which there are two types of particle, an
93: 2131: 378: 65: 1161: 848:{\displaystyle \left({\frac {\partial ^{2}U}{\partial X^{2}}}\right)_{S}=-T\left({\frac {\partial ^{2}S}{\partial X^{2}}}\right)_{U}} 72: 17: 728:
It is seen that the energy is at an extremum at equilibrium. By similar but somewhat more lengthy argument it can be shown that
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are the respective particle numbers for these particles, then the internal constraint is that the total number of
2536:{\displaystyle A_{0}={\underset {S_{0}}{\mathrm {min} }}({\underset {x}{\mathrm {min} }}(U(S_{0},x))-T_{0}S_{0})} 50: 280:, etc.). The entropy of the system may likewise be written as a function of the other extensive parameters as 1335: 283: 183: 1010: 130: 1906: 917: 86: 1277: 891:
has been placed on top of the cylinder. It presses down on the top of the cylinder with a force of
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Alternatively, suppose we have a cylinder containing an ideal gas, with cross sectional area
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are shown. It follows from the properties of an exact differential (see equation 8 in the
8: 2343:{\displaystyle A_{0}(T_{0})={\underset {S_{0}}{\mathrm {min} }}(U_{0}(S_{0})-T_{0}S_{0})} 273: 1538:{\displaystyle A(T,V,\{N_{j}\})={\underset {S}{\mathrm {min} }}(U(S,V,\{N_{j}\})-TS)\,} 532: 2783: 2773: 2752: 911:
is given by the internal energy of the gas plus the potential energy of the weight:
2125:. By the definition of the Legendre transform, the Helmholtz free energy will be: 1325:
via the equations of state. As an example of another thermodynamic potential, the
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which is greater than zero, showing that the energy is, in fact, at a minimum.
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is constant and a small change in the energy of the system would be given by:
504:{\displaystyle \left({\frac {\partial ^{2}S}{\partial X^{2}}}\right)_{U}<0} 2798: 2787: 2380:
is the (unknown) temperature at equilibrium. Substituting the expression for
1637: 1625:{\displaystyle T=\left({\frac {\partial U}{\partial S}}\right)_{V,\{N_{j}\}}} 134: 1732:{\displaystyle U_{0}(S_{0})={\underset {x}{\mathrm {min} }}(U(S_{0},x))\,} 1414:
to that variable). For example, the Helmholtz free energy may be written:
1082:=0 at equilibrium and by the principle of minimum energy, we may say that 996:
is the number of particles in the gas, and the volume has been written as
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equilibrium with respect to any unconstrained internal variables for a
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The maximum entropy principle: For a closed system with fixed internal
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showing that the Helmholtz free energy is minimized at equilibrium.
28: 2748: 2211:{\displaystyle A(T,x)={\underset {S}{\mathrm {min} }}(U(S,x)-TS)\,} 426:{\displaystyle \left({\frac {\partial S}{\partial X}}\right)_{U}=0} 138: 1257:{\displaystyle U(S,V,\{N_{j}\})=TS-PV+\sum _{j}\mu _{j}N_{j}\,} 163:
The minimum energy principle: For a closed system with fixed
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which simply states that the upward gas pressure force (
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will be a function only of the chosen value of entropy
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which stands for any internal unconstrained variables.
1086:=0 at equilibrium, yielding the equilibrium condition: 2770:
Thermodynamics and an Introduction to Thermostatistics
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New York: John Wiley & Sons. 2796: 1078:Since the entropy is constant, we may say that 992:is pressure, μ is the chemical potential, 1552:  becomes equal to the temperature since 1548:and the minimum will occur when the variable 1617: 1604: 1516: 1503: 1455: 1442: 1370: 1357: 1309: 1296: 1267:where the intensive parameters (T, P, μ 1196: 1183: 1145: 175: 2207: 1949: 1728: 1534: 1391: 1271:) are functions of the internal energy's 1253: 1120: 1058: 1042: 1026: 966: 590: 113:Learn how and when to remove this message 2546:By exchanging the order of the extrema: 137:, with constant external parameters and 18:Minimum total potential energy principle 1395:{\displaystyle A(T,V,\{N_{j}\})=U-TS\,} 334:{\displaystyle S(U,X_{1},X_{2},\dots )} 234:{\displaystyle U(S,X_{1},X_{2},\dots )} 2797: 2764: 1068:{\displaystyle dU=T\,dS-PA\,dx+mg\,dx} 535:article) and from the energy/entropy 1953:{\displaystyle N_{A}=N_{1}+2N_{2}\,} 970:{\displaystyle U=TS-PAx+\mu N+mgx\,} 899:is the acceleration due to gravity. 129:is essentially a restatement of the 51:adding citations to reliable sources 22: 13: 2684: 2681: 2678: 2599: 2596: 2593: 2578: 2575: 2572: 2467: 2464: 2461: 2439: 2436: 2433: 2269: 2266: 2263: 2165: 2162: 2159: 1688: 1685: 1682: 1584: 1576: 1473: 1470: 1467: 819: 805: 761: 747: 690: 682: 644: 636: 609: 601: 565: 557: 469: 455: 398: 390: 180:The total energy of the system is 14: 2816: 2017:variables with a single variable 887:. Suppose that a weight of mass 27: 1318:{\displaystyle (S,V,\{N_{j}\})} 156:(i.e. an isolated system), the 38:needs additional citations for 2728: 2725: 2706: 2693: 2669: 2666: 2640: 2621: 2615: 2587: 2530: 2504: 2501: 2482: 2476: 2455: 2337: 2311: 2298: 2285: 2254: 2241: 2204: 2192: 2180: 2174: 2150: 2138: 1725: 1722: 1703: 1697: 1673: 1660: 1531: 1519: 1488: 1482: 1458: 1427: 1373: 1342: 1312: 1281: 1199: 1168: 328: 290: 228: 190: 1: 2758: 2058:{\displaystyle x=N_{1}/N_{2}} 62:"Principle of minimum energy" 276:of the system (e.g. volume, 171:is minimized at equilibrium. 160:is maximized at equilibrium. 131:second law of thermodynamics 7: 861: 539:that, for a closed system: 127:principle of minimum energy 10: 2821: 1124:{\displaystyle 0=-PA+mg\,} 15: 2755:, are similarly derived. 1963:we may then replace the 1153:thermodynamic potentials 1146:Thermodynamic potentials 176:Mathematical explanation 16:Not to be confused with 133:. It states that for a 2735: 2537: 2401: 2374: 2344: 2212: 2119: 2092: 2059: 2011: 1984: 1954: 1894: 1863: 1836: 1790: 1763: 1733: 1626: 1539: 1396: 1319: 1258: 1125: 1069: 971: 883:and a variable height 849: 719: 505: 427: 366: 335: 266: 235: 2736: 2538: 2402: 2400:{\displaystyle U_{0}} 2375: 2373:{\displaystyle T_{0}} 2345: 2213: 2120: 2118:{\displaystyle S_{0}} 2093: 2091:{\displaystyle U_{0}} 2060: 2012: 2010:{\displaystyle N_{2}} 1985: 1983:{\displaystyle N_{1}} 1955: 1895: 1893:{\displaystyle N_{A}} 1864: 1862:{\displaystyle N_{2}} 1837: 1835:{\displaystyle N_{1}} 1791: 1789:{\displaystyle S_{0}} 1764: 1762:{\displaystyle U_{0}} 1734: 1627: 1540: 1397: 1327:Helmholtz free energy 1320: 1259: 1126: 1070: 972: 850: 720: 506: 428: 367: 365:{\displaystyle X_{i}} 336: 267: 265:{\displaystyle X_{i}} 236: 2553: 2414: 2384: 2357: 2228: 2132: 2102: 2075: 2021: 1994: 1967: 1907: 1877: 1846: 1819: 1773: 1746: 1647: 1559: 1421: 1336: 1278: 1162: 1093: 1011: 918: 735: 546: 443: 379: 349: 284: 274:extensive parameters 249: 245:is entropy, and the 184: 47:improve this article 1408:Legendre transforms 2766:Callen, Herbert B. 2731: 2691: 2613: 2585: 2533: 2474: 2453: 2397: 2370: 2340: 2283: 2208: 2172: 2115: 2088: 2055: 2007: 1980: 1950: 1890: 1859: 1832: 1786: 1759: 1729: 1695: 1622: 1535: 1480: 1392: 1315: 1254: 1232: 1121: 1065: 967: 845: 715: 533:exact differential 501: 423: 362: 331: 262: 231: 2753:Gibbs free energy 2676: 2591: 2570: 2459: 2431: 2261: 2157: 1680: 1591: 1465: 1273:natural variables 1223: 833: 775: 697: 663: 651: 616: 572: 537:equation of state 483: 405: 144:In contrast, for 123: 122: 115: 97: 2812: 2791: 2740: 2738: 2737: 2732: 2718: 2717: 2705: 2704: 2692: 2687: 2665: 2664: 2655: 2654: 2633: 2632: 2614: 2612: 2611: 2602: 2586: 2581: 2565: 2564: 2542: 2540: 2539: 2534: 2529: 2528: 2519: 2518: 2494: 2493: 2475: 2470: 2454: 2452: 2451: 2442: 2426: 2425: 2406: 2404: 2403: 2398: 2396: 2395: 2379: 2377: 2376: 2371: 2369: 2368: 2349: 2347: 2346: 2341: 2336: 2335: 2326: 2325: 2310: 2309: 2297: 2296: 2284: 2282: 2281: 2272: 2253: 2252: 2240: 2239: 2217: 2215: 2214: 2209: 2173: 2168: 2124: 2122: 2121: 2116: 2114: 2113: 2097: 2095: 2094: 2089: 2087: 2086: 2064: 2062: 2061: 2056: 2054: 2053: 2044: 2039: 2038: 2016: 2014: 2013: 2008: 2006: 2005: 1989: 1987: 1986: 1981: 1979: 1978: 1959: 1957: 1956: 1951: 1948: 1947: 1932: 1931: 1919: 1918: 1899: 1897: 1896: 1891: 1889: 1888: 1868: 1866: 1865: 1860: 1858: 1857: 1841: 1839: 1838: 1833: 1831: 1830: 1795: 1793: 1792: 1787: 1785: 1784: 1768: 1766: 1765: 1760: 1758: 1757: 1738: 1736: 1735: 1730: 1715: 1714: 1696: 1691: 1672: 1671: 1659: 1658: 1631: 1629: 1628: 1623: 1621: 1620: 1616: 1615: 1596: 1592: 1590: 1582: 1574: 1544: 1542: 1541: 1536: 1515: 1514: 1481: 1476: 1454: 1453: 1401: 1399: 1398: 1393: 1369: 1368: 1324: 1322: 1321: 1316: 1308: 1307: 1263: 1261: 1260: 1255: 1252: 1251: 1242: 1241: 1231: 1195: 1194: 1130: 1128: 1127: 1122: 1074: 1072: 1071: 1066: 984:is temperature, 976: 974: 973: 968: 854: 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2355: 2354: 2331: 2327: 2321: 2317: 2305: 2301: 2292: 2288: 2277: 2273: 2262: 2260: 2248: 2244: 2235: 2231: 2229: 2226: 2225: 2158: 2156: 2133: 2130: 2129: 2109: 2105: 2103: 2100: 2099: 2082: 2078: 2076: 2073: 2072: 2068: 2049: 2045: 2040: 2034: 2030: 2022: 2019: 2018: 2001: 1997: 1995: 1992: 1991: 1974: 1970: 1968: 1965: 1964: 1943: 1939: 1927: 1923: 1914: 1910: 1908: 1905: 1904: 1900:is conserved: 1884: 1880: 1878: 1875: 1874: 1853: 1849: 1847: 1844: 1843: 1826: 1822: 1820: 1817: 1816: 1813: 1780: 1776: 1774: 1771: 1770: 1753: 1749: 1747: 1744: 1743: 1710: 1706: 1681: 1679: 1667: 1663: 1654: 1650: 1648: 1645: 1644: 1611: 1607: 1597: 1583: 1575: 1573: 1569: 1568: 1560: 1557: 1556: 1510: 1506: 1466: 1464: 1449: 1445: 1422: 1419: 1418: 1364: 1360: 1337: 1334: 1333: 1303: 1299: 1279: 1276: 1275: 1270: 1247: 1243: 1237: 1233: 1227: 1190: 1186: 1163: 1160: 1159: 1148: 1094: 1091: 1090: 1012: 1009: 1008: 919: 916: 915: 864: 839: 826: 822: 818: 808: 804: 803: 801: 797: 796: 781: 768: 764: 760: 750: 746: 745: 743: 739: 738: 736: 733: 732: 703: 689: 681: 679: 675: 674: 657: 643: 635: 633: 629: 628: 622: 608: 600: 598: 594: 593: 591: 578: 564: 556: 554: 550: 549: 547: 544: 543: 514:at equilibrium. 511: 489: 476: 472: 468: 458: 454: 453: 451: 447: 446: 444: 441: 440: 437: 433: 411: 397: 389: 387: 383: 382: 380: 377: 376: 356: 352: 350: 347: 346: 341:. Suppose that 316: 312: 303: 299: 285: 282: 281: 278:particle number 256: 252: 250: 247: 246: 216: 212: 203: 199: 185: 182: 181: 178: 119: 108: 102: 99: 56: 54: 44: 32: 21: 12: 11: 5: 2818: 2808: 2807: 2805:Thermodynamics 2793: 2792: 2778: 2760: 2757: 2742: 2741: 2730: 2727: 2724: 2721: 2716: 2712: 2708: 2703: 2699: 2695: 2690: 2686: 2683: 2680: 2674: 2671: 2668: 2663: 2659: 2653: 2649: 2645: 2642: 2639: 2636: 2631: 2627: 2623: 2620: 2617: 2610: 2606: 2601: 2598: 2595: 2589: 2584: 2580: 2577: 2574: 2568: 2563: 2559: 2544: 2543: 2532: 2527: 2523: 2517: 2513: 2509: 2506: 2503: 2500: 2497: 2492: 2488: 2484: 2481: 2478: 2473: 2469: 2466: 2463: 2457: 2450: 2446: 2441: 2438: 2435: 2429: 2424: 2420: 2394: 2390: 2367: 2363: 2351: 2350: 2339: 2334: 2330: 2324: 2320: 2316: 2313: 2308: 2304: 2300: 2295: 2291: 2287: 2280: 2276: 2271: 2268: 2265: 2259: 2256: 2251: 2247: 2243: 2238: 2234: 2219: 2218: 2206: 2203: 2200: 2197: 2194: 2191: 2188: 2185: 2182: 2179: 2176: 2171: 2167: 2164: 2161: 2155: 2152: 2149: 2146: 2143: 2140: 2137: 2112: 2108: 2085: 2081: 2052: 2048: 2043: 2037: 2033: 2029: 2026: 2004: 2000: 1977: 1973: 1961: 1960: 1946: 1942: 1938: 1935: 1930: 1926: 1922: 1917: 1913: 1887: 1883: 1856: 1852: 1829: 1825: 1811: 1802: 1783: 1779: 1756: 1752: 1740: 1739: 1727: 1724: 1721: 1718: 1713: 1709: 1705: 1702: 1699: 1694: 1690: 1687: 1684: 1678: 1675: 1670: 1666: 1662: 1657: 1653: 1633: 1632: 1619: 1614: 1610: 1606: 1603: 1600: 1595: 1589: 1586: 1581: 1578: 1572: 1567: 1564: 1546: 1545: 1533: 1530: 1527: 1524: 1521: 1518: 1513: 1509: 1505: 1502: 1499: 1496: 1493: 1490: 1487: 1484: 1479: 1475: 1472: 1469: 1463: 1460: 1457: 1452: 1448: 1444: 1441: 1438: 1435: 1432: 1429: 1426: 1403: 1402: 1390: 1387: 1384: 1381: 1378: 1375: 1372: 1367: 1363: 1359: 1356: 1353: 1350: 1347: 1344: 1341: 1314: 1311: 1306: 1302: 1298: 1295: 1292: 1289: 1286: 1283: 1268: 1265: 1264: 1250: 1246: 1240: 1236: 1230: 1226: 1222: 1219: 1216: 1213: 1210: 1207: 1204: 1201: 1198: 1193: 1189: 1185: 1182: 1179: 1176: 1173: 1170: 1167: 1147: 1144: 1132: 1131: 1119: 1116: 1113: 1110: 1107: 1104: 1101: 1098: 1076: 1075: 1064: 1061: 1057: 1054: 1051: 1048: 1045: 1041: 1038: 1035: 1032: 1029: 1025: 1022: 1019: 1016: 978: 977: 965: 962: 959: 956: 953: 950: 947: 944: 941: 938: 935: 932: 929: 926: 923: 869:kinetic energy 863: 860: 856: 855: 842: 837: 829: 825: 821: 816: 811: 807: 800: 795: 792: 789: 784: 779: 771: 767: 763: 758: 753: 749: 742: 726: 725: 714: 711: 706: 701: 695: 692: 687: 684: 678: 673: 670: 667: 660: 655: 649: 646: 641: 638: 632: 625: 620: 614: 611: 606: 603: 597: 589: 586: 581: 576: 570: 567: 562: 559: 553: 516: 515: 500: 497: 492: 487: 479: 475: 471: 466: 461: 457: 450: 422: 419: 414: 409: 403: 400: 395: 392: 386: 359: 355: 345:is one of the 330: 327: 324: 319: 315: 311: 306: 302: 298: 295: 292: 289: 272:are the other 259: 255: 230: 227: 224: 219: 215: 211: 206: 202: 198: 195: 192: 189: 177: 174: 173: 172: 161: 121: 120: 35: 33: 26: 9: 6: 4: 3: 2: 2817: 2806: 2803: 2802: 2800: 2789: 2785: 2781: 2779:0-471-86256-8 2775: 2771: 2767: 2763: 2762: 2756: 2754: 2750: 2745: 2722: 2719: 2714: 2710: 2701: 2697: 2688: 2672: 2661: 2657: 2651: 2647: 2643: 2637: 2634: 2629: 2625: 2618: 2608: 2604: 2582: 2566: 2561: 2557: 2549: 2548: 2547: 2525: 2521: 2515: 2511: 2507: 2498: 2495: 2490: 2486: 2479: 2471: 2448: 2444: 2427: 2422: 2418: 2410: 2409: 2408: 2392: 2388: 2365: 2361: 2332: 2328: 2322: 2318: 2314: 2306: 2302: 2293: 2289: 2278: 2274: 2257: 2249: 2245: 2236: 2232: 2224: 2223: 2222: 2201: 2198: 2195: 2189: 2186: 2183: 2177: 2169: 2153: 2147: 2144: 2141: 2135: 2128: 2127: 2126: 2110: 2106: 2083: 2079: 2067: 2050: 2046: 2041: 2035: 2031: 2027: 2024: 2002: 1998: 1975: 1971: 1944: 1940: 1936: 1933: 1928: 1924: 1920: 1915: 1911: 1903: 1902: 1901: 1885: 1881: 1872: 1854: 1850: 1827: 1823: 1815:molecule. If 1814: 1807: 1801: 1799: 1781: 1777: 1754: 1750: 1719: 1716: 1711: 1707: 1700: 1692: 1676: 1668: 1664: 1655: 1651: 1643: 1642: 1641: 1639: 1638:closed system 1612: 1608: 1601: 1598: 1593: 1587: 1579: 1570: 1565: 1562: 1555: 1554: 1553: 1551: 1528: 1525: 1522: 1511: 1507: 1500: 1497: 1494: 1491: 1485: 1477: 1461: 1450: 1446: 1439: 1436: 1433: 1430: 1424: 1417: 1416: 1415: 1413: 1409: 1388: 1385: 1382: 1379: 1376: 1365: 1361: 1354: 1351: 1348: 1345: 1339: 1332: 1331: 1330: 1328: 1304: 1300: 1293: 1290: 1287: 1284: 1274: 1248: 1244: 1238: 1234: 1228: 1224: 1220: 1217: 1214: 1211: 1208: 1205: 1202: 1191: 1187: 1180: 1177: 1174: 1171: 1165: 1158: 1157: 1156: 1154: 1143: 1141: 1137: 1117: 1114: 1111: 1108: 1105: 1102: 1099: 1096: 1089: 1088: 1087: 1085: 1081: 1062: 1059: 1055: 1052: 1049: 1046: 1043: 1039: 1036: 1033: 1030: 1027: 1023: 1020: 1017: 1014: 1007: 1006: 1005: 1003: 999: 995: 991: 987: 983: 963: 960: 957: 954: 951: 948: 945: 942: 939: 936: 933: 930: 927: 924: 921: 914: 913: 912: 910: 905: 902:Suppose that 900: 898: 894: 890: 886: 882: 877: 873: 870: 859: 840: 835: 827: 823: 814: 809: 798: 793: 790: 787: 782: 777: 769: 765: 756: 751: 740: 731: 730: 729: 712: 709: 704: 699: 693: 685: 676: 671: 668: 665: 658: 653: 647: 639: 630: 623: 618: 612: 604: 595: 587: 584: 579: 574: 568: 560: 551: 542: 541: 540: 538: 534: 530: 526: 522: 498: 495: 490: 485: 477: 473: 464: 459: 448: 420: 417: 412: 407: 401: 393: 384: 375: 374: 373: 357: 353: 344: 325: 322: 317: 313: 309: 304: 300: 296: 293: 287: 279: 275: 257: 253: 244: 225: 222: 217: 213: 209: 204: 200: 196: 193: 187: 170: 166: 162: 159: 155: 151: 150: 149: 147: 142: 140: 136: 135:closed system 132: 128: 117: 114: 106: 95: 92: 88: 85: 81: 78: 74: 71: 67: 64: –  63: 59: 58:Find sources: 52: 48: 42: 41: 36:This article 34: 30: 25: 24: 19: 2769: 2746: 2743: 2545: 2352: 2220: 2069: 1962: 1870: 1809: 1808:atom and an 1805: 1803: 1797: 1741: 1634: 1549: 1547: 1404: 1329:is written: 1266: 1149: 1139: 1135: 1133: 1083: 1079: 1077: 1001: 997: 993: 989: 988:is entropy, 985: 981: 979: 908: 903: 901: 896: 892: 888: 884: 880: 878: 874: 865: 857: 727: 528: 524: 520: 517: 342: 242: 179: 168: 167:, the total 164: 157: 153: 143: 126: 124: 109: 100: 90: 83: 76: 69: 57: 45:Please help 40:verification 37: 103:August 2021 2759:References 73:newspapers 2788:485487601 2644:− 2508:− 2315:− 2196:− 1585:∂ 1577:∂ 1523:− 1412:conjugate 1383:− 1235:μ 1225:∑ 1212:− 1103:− 1034:− 949:μ 934:− 820:∂ 806:∂ 791:− 762:∂ 748:∂ 691:∂ 683:∂ 669:− 645:∂ 637:∂ 610:∂ 602:∂ 588:− 566:∂ 558:∂ 470:∂ 456:∂ 399:∂ 391:∂ 326:… 226:… 2799:Category 2768:(1985). 2749:Enthalpy 862:Examples 165:entropy 158:entropy 139:entropy 87:scholar 2786:  2776:  2353:where 1873:atoms 1742:where 980:where 895:where 512:  438:  434:  241:where 169:energy 154:energy 89:  82:  75:  68:  60:  527:, or 94:JSTOR 80:books 2784:OCLC 2774:ISBN 2751:and 2747:The 1990:and 1842:and 1769:and 998:V=Ax 496:< 436:and 125:The 66:news 1142:). 49:by 2801:: 2782:. 2407:: 1140:mg 1136:PA 1084:dU 1080:dS 893:mg 523:, 2790:. 2729:) 2726:) 2723:x 2720:, 2715:0 2711:T 2707:( 2702:0 2698:A 2694:( 2689:x 2685:n 2682:i 2679:m 2673:= 2670:) 2667:) 2662:0 2658:S 2652:0 2648:T 2641:) 2638:x 2635:, 2630:0 2626:S 2622:( 2619:U 2616:( 2609:0 2605:S 2600:n 2597:i 2594:m 2588:( 2583:x 2579:n 2576:i 2573:m 2567:= 2562:0 2558:A 2531:) 2526:0 2522:S 2516:0 2512:T 2505:) 2502:) 2499:x 2496:, 2491:0 2487:S 2483:( 2480:U 2477:( 2472:x 2468:n 2465:i 2462:m 2456:( 2449:0 2445:S 2440:n 2437:i 2434:m 2428:= 2423:0 2419:A 2393:0 2389:U 2366:0 2362:T 2338:) 2333:0 2329:S 2323:0 2319:T 2312:) 2307:0 2303:S 2299:( 2294:0 2290:U 2286:( 2279:0 2275:S 2270:n 2267:i 2264:m 2258:= 2255:) 2250:0 2246:T 2242:( 2237:0 2233:A 2205:) 2202:S 2199:T 2193:) 2190:x 2187:, 2184:S 2181:( 2178:U 2175:( 2170:S 2166:n 2163:i 2160:m 2154:= 2151:) 2148:x 2145:, 2142:T 2139:( 2136:A 2111:0 2107:S 2084:0 2080:U 2051:2 2047:N 2042:/ 2036:1 2032:N 2028:= 2025:x 2003:2 1999:N 1976:1 1972:N 1945:2 1941:N 1937:2 1934:+ 1929:1 1925:N 1921:= 1916:A 1912:N 1886:A 1882:N 1871:A 1855:2 1851:N 1828:1 1824:N 1812:2 1810:A 1806:A 1798:x 1782:0 1778:S 1755:0 1751:U 1726:) 1723:) 1720:x 1717:, 1712:0 1708:S 1704:( 1701:U 1698:( 1693:x 1689:n 1686:i 1683:m 1677:= 1674:) 1669:0 1665:S 1661:( 1656:0 1652:U 1618:} 1613:j 1609:N 1605:{ 1602:, 1599:V 1594:) 1588:S 1580:U 1571:( 1566:= 1563:T 1550:T 1532:) 1529:S 1526:T 1520:) 1517:} 1512:j 1508:N 1504:{ 1501:, 1498:V 1495:, 1492:S 1489:( 1486:U 1483:( 1478:S 1474:n 1471:i 1468:m 1462:= 1459:) 1456:} 1451:j 1447:N 1443:{ 1440:, 1437:V 1434:, 1431:T 1428:( 1425:A 1389:S 1386:T 1380:U 1377:= 1374:) 1371:} 1366:j 1362:N 1358:{ 1355:, 1352:V 1349:, 1346:T 1343:( 1340:A 1313:) 1310:} 1305:j 1301:N 1297:{ 1294:, 1291:V 1288:, 1285:S 1282:( 1269:j 1249:j 1245:N 1239:j 1229:j 1221:+ 1218:V 1215:P 1209:S 1206:T 1203:= 1200:) 1197:} 1192:j 1188:N 1184:{ 1181:, 1178:V 1175:, 1172:S 1169:( 1166:U 1118:g 1115:m 1112:+ 1109:A 1106:P 1100:= 1097:0 1063:x 1060:d 1056:g 1053:m 1050:+ 1047:x 1044:d 1040:A 1037:P 1031:S 1028:d 1024:T 1021:= 1018:U 1015:d 1002:N 994:N 990:P 986:S 982:T 964:x 961:g 958:m 955:+ 952:N 946:+ 943:x 940:A 937:P 931:S 928:T 925:= 922:U 909:x 904:x 897:g 889:m 885:x 881:A 841:U 836:) 828:2 824:X 815:S 810:2 799:( 794:T 788:= 783:S 778:) 770:2 766:X 757:U 752:2 741:( 713:0 710:= 705:U 700:) 694:X 686:S 677:( 672:T 666:= 659:X 654:) 648:U 640:S 631:( 624:U 619:) 613:X 605:S 596:( 585:= 580:S 575:) 569:X 561:U 552:( 529:X 525:S 521:U 499:0 491:U 486:) 478:2 474:X 465:S 460:2 449:( 421:0 418:= 413:U 408:) 402:X 394:S 385:( 358:i 354:X 343:X 329:) 323:, 318:2 314:X 310:, 305:1 301:X 297:, 294:U 291:( 288:S 258:i 254:X 243:S 229:) 223:, 218:2 214:X 210:, 205:1 201:X 197:, 194:S 191:( 188:U 116:) 110:( 105:) 101:( 91:· 84:· 77:· 70:· 43:. 20:.

Index

Minimum total potential energy principle

verification
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"Principle of minimum energy"
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JSTOR
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second law of thermodynamics
closed system
entropy
isolated systems
extensive parameters
particle number
exact differential
equation of state
kinetic energy
thermodynamic potentials
natural variables
Helmholtz free energy
Legendre transforms
conjugate
closed system
Enthalpy
Gibbs free energy
Callen, Herbert B.

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