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Quasistatic process

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42: 1612: 1705:) of the system at any instant during the whole process; otherwise, since no internal equilibrium is established, different parts of the system would have different values of these quantities, so a single value per quantity may not be sufficient to represent the whole system. In other words, when an 1742:
between two bodies on two finitely different temperatures, where the heat transfer rate is controlled by a poorly conductive partition between the two bodies. In this case, no matter how slowly the process takes place, the state of the composite system consisting of the two bodies is far from
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is irreversible; although the system is always in internal thermal equilibrium, the friction ensures the generation of dissipative entropy, which goes against the definition of reversibility. Any engineer would remember to include friction when calculating the dissipative entropy generation.
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are quasi-static, most authors do not require a general quasi-static process to maintain equilibrium between system and surroundings and avoid dissipation, which are defining characteristics of a reversible process. For example, quasi-static compression of a system by a piston subject to
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equilibrium, since thermal equilibrium for this composite system requires that the two bodies be at the same temperature. Nevertheless, the entropy change for each body can be calculated using the Clausius equality for reversible heat transfer.
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remains uniform throughout the system at each instant of time during the process. Such an idealized process is a succession of physical equilibrium states, characterized by infinite slowness.
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that happens slowly enough for the system to remain in internal physical (but not necessarily chemical)
1671: 1483: 1060: 373: 219: 68: 1979: 1690: 1563: 1488: 1478: 278: 152: 140: 1508: 1503: 1270: 292: 253: 166: 1678:. An example of this is quasi-static expansion of a mixture of hydrogen and oxygen gas, where the 2116: 1913: 1756: 1597: 1260: 1208: 1121: 1066: 1011: 440: 424: 311: 263: 248: 238: 47: 41: 1255: 845: 798: 713: 666: 578: 531: 2267: 1853: 1592: 1553: 1543: 1115: 913: 749: 741: 614: 243: 233: 175: 1763: 1702: 1513: 1498: 1438: 1433: 1250: 1245: 971: 895: 363: 228: 1698: 1463: 1311: 965: 606: 429: 190: 157: 27:
Thermodynamic process in which equilibrium is maintained throughout the process's duration
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An example of a quasi-static process that is not idealizable as reversible is slow
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Only in a quasi-static thermodynamic process can we exactly define
378: 2208:{\displaystyle W_{1-2}={\frac {P_{1}V_{1}-P_{2}V_{2}}{n-1}}} 2107:{\displaystyle W_{1-2}=P_{1}V_{1}\ln {\frac {V_{2}}{V_{1}}}} 2266:. United States: Addison Wesley Longman. pp. 20–21. 2125: 2034: 1982: 1922: 1862: 1772: 1124: 1069: 1014: 974: 848: 827: 801: 780: 752: 716: 695: 669: 648: 617: 581: 560: 534: 513: 485: 2207: 2106: 2020: 1960: 1902: 1842: 1160: 1105: 1050: 995: 857: 833: 810: 786: 761: 725: 701: 678: 654: 629: 590: 566: 543: 519: 494: 1843:{\displaystyle W_{1-2}=\int P\,dV=P(V_{2}-V_{1})} 1635: 8: 1642: 1628: 1191: 343: 162: 40: 29: 2185: 2175: 2162: 2152: 2145: 2130: 2124: 2096: 2086: 2080: 2068: 2058: 2039: 2033: 2006: 1996: 1981: 1948: 1927: 1921: 1867: 1861: 1831: 1818: 1798: 1777: 1771: 1747:PV-work in various quasi-static processes 1707:equation for a change in a state function 1682:of the system changes so slowly that the 1123: 1068: 1013: 973: 847: 826: 800: 779: 751: 715: 694: 668: 647: 616: 580: 559: 533: 512: 484: 2288:A Textbook of Engineering Thermodynamics 2241: 1388: 1365: 1319: 1279: 1229: 1194: 387: 362: 291: 218: 165: 32: 2252:, Clarendon Press, Oxford, page 1507. 1717:, it implies a quasi-static process. 7: 2230:Reversible process (thermodynamics) 1961:{\displaystyle W_{1-2}=\int P\,dV,} 2264:An Introduction to Thermal Physics 1903:{\displaystyle W_{1-2}=\int PdV=0} 849: 802: 717: 670: 582: 535: 355:Intensive and extensive properties 25: 1611: 1610: 930:Table of thermodynamic equations 2248:Lewis, C.T., Short, C. (1879). 2021:{\displaystyle PV=P_{1}V_{1}=C} 1406:Maxwell's thermodynamic surface 1837: 1811: 1721:Relation to reversible process 1140: 1128: 1085: 1073: 1030: 1018: 990: 978: 1: 1307:Mechanical equivalent of heat 919:Onsager reciprocal relations 1411:Entropy as energy dispersal 1222:"Perpetual motion" machines 1161:{\displaystyle G(T,p)=H-TS} 1106:{\displaystyle A(T,V)=U-TS} 1051:{\displaystyle H(S,p)=U+pV} 2341: 2262:Schroeder, Daniel (2000). 1750: 858:{\displaystyle \partial T} 811:{\displaystyle \partial V} 726:{\displaystyle \partial p} 679:{\displaystyle \partial V} 591:{\displaystyle \partial T} 544:{\displaystyle \partial S} 1676:thermodynamic equilibrium 1670:, meaning ‘as if’), is a 1664:quasi-equilibrium process 1332:An Inquiry Concerning the 1345:Heterogeneous Substances 762:{\displaystyle \alpha =} 630:{\displaystyle \beta =-} 2320:Thermodynamic processes 1972:(pressure) varies with 18:Quasistatic equilibrium 2209: 2108: 2022: 1962: 1912:Constant temperature: 1904: 1844: 1162: 1107: 1052: 997: 996:{\displaystyle U(S,V)} 859: 835: 812: 788: 763: 727: 703: 680: 656: 631: 592: 568: 545: 521: 496: 475:Specific heat capacity 79:Quantum thermodynamics 2325:Statistical mechanics 2286:Rajput, R.K. (2010). 2210: 2109: 2023: 1963: 1905: 1845: 1753:Work (thermodynamics) 1672:thermodynamic process 1343:On the Equilibrium of 1163: 1108: 1061:Helmholtz free energy 1053: 998: 860: 836: 813: 789: 764: 728: 704: 681: 657: 632: 593: 569: 546: 522: 497: 2123: 2117:Polytropic processes 2032: 1980: 1920: 1914:Isothermal processes 1860: 1770: 1727:reversible processes 1691:intensive quantities 1660:quasi-static process 1356:Motive Power of Fire 1122: 1067: 1012: 972: 924:Bridgman's equations 901:Fundamental relation 846: 825: 799: 778: 750: 714: 693: 667: 646: 615: 579: 558: 532: 511: 483: 1854:Isochoric processes 1762:Constant pressure: 1693:(such as pressure, 1334:Source ... Friction 1266:Loschmidt's paradox 458:Material properties 336:Conjugate variables 2250:A Latin Dictionary 2205: 2104: 2018: 1958: 1900: 1840: 1764:Isobaric processes 1757:Ideal gas equation 1662:, also known as a 1598:Order and disorder 1354:Reflections on the 1261:Heat death paradox 1158: 1103: 1048: 993: 855: 831: 808: 784: 759: 723: 699: 676: 652: 627: 588: 564: 541: 517: 495:{\displaystyle c=} 492: 465:Property databases 441:Reduced properties 425:Chemical potential 389:Functions of state 312:Thermal efficiency 48:Carnot heat engine 2203: 2102: 1852:Constant volume: 1652: 1651: 1593:Self-organization 1418: 1417: 1116:Gibbs free energy 914:Maxwell relations 872: 871: 868: 867: 834:{\displaystyle V} 787:{\displaystyle 1} 742:Thermal expansion 736: 735: 702:{\displaystyle V} 655:{\displaystyle 1} 601: 600: 567:{\displaystyle N} 520:{\displaystyle T} 448: 447: 364:Process functions 350:Property diagrams 329:System properties 319: 318: 284:Endoreversibility 176:Equation of state 16:(Redirected from 2332: 2304: 2299:H. DeVoe (2020) 2297: 2291: 2284: 2278: 2277: 2259: 2253: 2246: 2214: 2212: 2211: 2206: 2204: 2202: 2191: 2190: 2189: 2180: 2179: 2167: 2166: 2157: 2156: 2146: 2141: 2140: 2113: 2111: 2110: 2105: 2103: 2101: 2100: 2091: 2090: 2081: 2073: 2072: 2063: 2062: 2050: 2049: 2027: 2025: 2024: 2019: 2011: 2010: 2001: 2000: 1975: 1971: 1967: 1965: 1964: 1959: 1938: 1937: 1909: 1907: 1906: 1901: 1878: 1877: 1849: 1847: 1846: 1841: 1836: 1835: 1823: 1822: 1788: 1787: 1703:specific entropy 1644: 1637: 1630: 1614: 1613: 1321:Key publications 1302: 1301:("living force") 1251:Brownian ratchet 1246:Entropy and life 1241:Entropy and time 1192: 1167: 1165: 1164: 1159: 1112: 1110: 1109: 1104: 1057: 1055: 1054: 1049: 1002: 1000: 999: 994: 896:Clausius theorem 891:Carnot's theorem 864: 862: 861: 856: 840: 838: 837: 832: 817: 815: 814: 809: 793: 791: 790: 785: 772: 771: 768: 766: 765: 760: 732: 730: 729: 724: 708: 706: 705: 700: 685: 683: 682: 677: 661: 659: 658: 653: 640: 639: 636: 634: 633: 628: 597: 595: 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509: 508: 481: 480: 460: 450: 449: 430:Particle number 383: 342: 331: 321: 320: 279:Irreversibility 191:State of matter 158:Isolated system 143: 133: 132: 131: 106: 96: 95: 91:Non-equilibrium 83: 58: 50: 28: 23: 22: 15: 12: 11: 5: 2338: 2336: 2328: 2327: 2322: 2312: 2311: 2306: 2305: 2292: 2279: 2272: 2254: 2240: 2239: 2237: 2234: 2233: 2232: 2227: 2220: 2217: 2216: 2215: 2201: 2198: 2195: 2188: 2184: 2178: 2174: 2170: 2165: 2161: 2155: 2151: 2144: 2139: 2136: 2133: 2129: 2114: 2099: 2095: 2089: 2085: 2079: 2076: 2071: 2067: 2061: 2057: 2053: 2048: 2045: 2042: 2038: 2017: 2014: 2009: 2005: 1999: 1995: 1991: 1988: 1985: 1957: 1954: 1951: 1947: 1944: 1941: 1936: 1933: 1930: 1926: 1910: 1899: 1896: 1893: 1890: 1887: 1884: 1881: 1876: 1873: 1870: 1866: 1850: 1839: 1834: 1830: 1826: 1821: 1817: 1813: 1810: 1807: 1804: 1801: 1797: 1794: 1791: 1786: 1783: 1780: 1776: 1748: 1745: 1722: 1719: 1656:thermodynamics 1650: 1649: 1647: 1646: 1639: 1632: 1624: 1621: 1620: 1619: 1618: 1605: 1604: 1601: 1600: 1595: 1590: 1585: 1579: 1576: 1575: 1572: 1571: 1567: 1566: 1561: 1556: 1551: 1546: 1541: 1536: 1531: 1526: 1521: 1516: 1511: 1506: 1501: 1496: 1491: 1486: 1481: 1476: 1471: 1466: 1461: 1456: 1451: 1446: 1441: 1436: 1430: 1429: 1426: 1425: 1422: 1421: 1416: 1415: 1414: 1413: 1408: 1400: 1399: 1397: 1396: 1393: 1389: 1386: 1385: 1383: 1382: 1377: 1375:Thermodynamics 1371: 1368: 1367: 1363: 1362: 1361: 1360: 1351: 1349: 1340: 1338: 1329: 1324: 1323: 1317: 1316: 1315: 1314: 1309: 1304: 1292: 1291: 1289:Caloric theory 1285: 1282: 1281: 1277: 1276: 1274: 1273: 1268: 1263: 1258: 1253: 1248: 1243: 1237: 1234: 1233: 1227: 1226: 1225: 1224: 1217: 1216: 1211: 1206: 1200: 1197: 1196: 1190: 1187: 1186: 1183: 1179: 1178: 1177: 1174: 1173: 1169: 1168: 1157: 1154: 1151: 1148: 1145: 1142: 1139: 1136: 1133: 1130: 1127: 1113: 1102: 1099: 1096: 1093: 1090: 1087: 1084: 1081: 1078: 1075: 1072: 1058: 1047: 1044: 1041: 1038: 1035: 1032: 1029: 1026: 1023: 1020: 1017: 1003: 992: 989: 986: 983: 980: 977: 962: 960: 959: 954: 948: 947: 942: 941: 938: 937: 934: 933: 926: 921: 916: 909: 908: 903: 898: 893: 887: 886: 881: 880: 877: 876: 870: 869: 866: 865: 854: 851: 841: 830: 819: 818: 807: 804: 794: 783: 769: 758: 755: 745: 738: 737: 734: 733: 722: 719: 709: 698: 687: 686: 675: 672: 662: 651: 637: 626: 623: 620: 610: 603: 602: 599: 598: 587: 584: 574: 563: 552: 551: 540: 537: 527: 516: 502: 491: 488: 478: 469: 468: 467: 461: 456: 455: 452: 451: 446: 445: 444: 443: 438: 433: 422: 411: 392: 391: 385: 384: 382: 381: 376: 370: 367: 366: 360: 359: 358: 357: 352: 333: 332: 327: 326: 323: 322: 317: 316: 315: 314: 309: 304: 296: 295: 289: 288: 287: 286: 281: 276: 271: 269:Free expansion 266: 261: 256: 251: 246: 241: 236: 231: 223: 222: 216: 215: 214: 213: 208: 206:Control volume 203: 198: 196:Phase (matter) 193: 188: 183: 178: 170: 169: 161: 160: 155: 150: 144: 139: 138: 135: 134: 130: 129: 124: 119: 114: 108: 107: 102: 101: 98: 97: 94: 93: 82: 81: 76: 71: 66: 60: 59: 56: 55: 52: 51: 46:The classical 45: 37: 36: 34:Thermodynamics 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2337: 2326: 2323: 2321: 2318: 2317: 2315: 2302: 2296: 2293: 2289: 2283: 2280: 2275: 2273:0-201-38027-7 2269: 2265: 2258: 2255: 2251: 2245: 2242: 2235: 2231: 2228: 2226: 2223: 2222: 2218: 2199: 2196: 2193: 2186: 2182: 2176: 2172: 2168: 2163: 2159: 2153: 2149: 2142: 2137: 2134: 2131: 2127: 2118: 2115: 2097: 2093: 2087: 2083: 2077: 2074: 2069: 2065: 2059: 2055: 2051: 2046: 2043: 2040: 2036: 2015: 2012: 2007: 2003: 1997: 1993: 1989: 1986: 1983: 1976:(volume) via 1955: 1952: 1949: 1945: 1942: 1939: 1934: 1931: 1928: 1924: 1915: 1911: 1897: 1894: 1891: 1888: 1885: 1882: 1879: 1874: 1871: 1868: 1864: 1855: 1851: 1832: 1828: 1824: 1819: 1815: 1808: 1805: 1802: 1799: 1795: 1792: 1789: 1784: 1781: 1778: 1774: 1765: 1761: 1760: 1758: 1754: 1746: 1744: 1741: 1740:heat transfer 1736: 1733: 1728: 1720: 1718: 1716: 1712: 1708: 1704: 1700: 1696: 1692: 1687: 1685: 1681: 1677: 1673: 1669: 1665: 1661: 1657: 1645: 1640: 1638: 1633: 1631: 1626: 1625: 1623: 1622: 1617: 1609: 1608: 1607: 1606: 1599: 1596: 1594: 1591: 1589: 1588:Self-assembly 1586: 1584: 1581: 1580: 1574: 1573: 1565: 1562: 1560: 1559:van der Waals 1557: 1555: 1552: 1550: 1547: 1545: 1542: 1540: 1537: 1535: 1532: 1530: 1527: 1525: 1522: 1520: 1517: 1515: 1512: 1510: 1507: 1505: 1502: 1500: 1497: 1495: 1492: 1490: 1487: 1485: 1484:von Helmholtz 1482: 1480: 1477: 1475: 1472: 1470: 1467: 1465: 1462: 1460: 1457: 1455: 1452: 1450: 1447: 1445: 1442: 1440: 1437: 1435: 1432: 1431: 1424: 1423: 1412: 1409: 1407: 1404: 1403: 1402: 1401: 1394: 1391: 1390: 1387: 1381: 1378: 1376: 1373: 1372: 1370: 1369: 1364: 1358: 1357: 1350: 1347: 1346: 1339: 1336: 1335: 1328: 1327: 1326: 1325: 1322: 1318: 1313: 1310: 1308: 1305: 1303: 1299: 1295: 1294: 1290: 1287: 1286: 1284: 1283: 1278: 1272: 1269: 1267: 1264: 1262: 1259: 1257: 1254: 1252: 1249: 1247: 1244: 1242: 1239: 1238: 1236: 1235: 1232: 1228: 1223: 1220: 1219: 1215: 1212: 1210: 1207: 1205: 1202: 1201: 1199: 1198: 1193: 1184: 1181: 1180: 1176: 1175: 1155: 1152: 1149: 1146: 1143: 1137: 1134: 1131: 1125: 1117: 1114: 1100: 1097: 1094: 1091: 1088: 1082: 1079: 1076: 1070: 1062: 1059: 1045: 1042: 1039: 1036: 1033: 1027: 1024: 1021: 1015: 1007: 1004: 987: 984: 981: 975: 967: 964: 963: 958: 955: 953: 950: 949: 945: 940: 939: 932: 931: 927: 925: 922: 920: 917: 915: 912: 911: 907: 906:Ideal gas law 904: 902: 899: 897: 894: 892: 889: 888: 884: 879: 878: 852: 842: 828: 821: 820: 805: 795: 781: 774: 773: 770: 756: 753: 746: 743: 740: 739: 720: 710: 696: 689: 688: 673: 663: 649: 642: 641: 638: 624: 621: 618: 611: 608: 605: 604: 585: 575: 561: 554: 553: 538: 528: 514: 507: 506: 503: 489: 486: 479: 476: 473: 472: 466: 463: 462: 459: 454: 453: 442: 439: 437: 436:Vapor quality 434: 432: 431: 426: 423: 421: 420: 415: 412: 409: 405: 404: 399: 396: 395: 394: 393: 390: 386: 380: 377: 375: 372: 371: 369: 368: 365: 361: 356: 353: 351: 348: 347: 346: 345: 341: 337: 330: 325: 324: 313: 310: 308: 305: 303: 300: 299: 298: 297: 294: 290: 285: 282: 280: 277: 275: 274:Reversibility 272: 270: 267: 265: 262: 260: 257: 255: 252: 250: 247: 245: 242: 240: 237: 235: 232: 230: 227: 226: 225: 224: 221: 217: 212: 209: 207: 204: 202: 199: 197: 194: 192: 189: 187: 184: 182: 179: 177: 174: 173: 172: 171: 168: 164: 159: 156: 154: 151: 149: 148:Closed system 146: 145: 142: 137: 136: 128: 125: 123: 120: 118: 115: 113: 110: 109: 105: 100: 99: 92: 88: 85: 84: 80: 77: 75: 72: 70: 67: 65: 62: 61: 54: 53: 49: 43: 39: 38: 35: 31: 19: 2295: 2287: 2282: 2263: 2257: 2249: 2244: 1737: 1724: 1714: 1710: 1688: 1667: 1666:(from Latin 1663: 1659: 1653: 1449:CarathĂ©odory 1380:Heat engines 1352: 1341: 1330: 1312:Motive power 1297: 957:Free entropy 928: 428: 427: / 417: 416: / 408:introduction 401: 400: / 339: 302:Heat engines 258: 89: / 1695:temperature 1271:Synergetics 952:Free energy 398:Temperature 259:Quasistatic 254:Isenthalpic 211:Instruments 201:Equilibrium 153:Open system 87:Equilibrium 69:Statistical 2314:Categories 2236:References 1725:While all 1583:Nucleation 1427:Scientists 1231:Philosophy 944:Potentials 307:Heat pumps 264:Polytropic 249:Isentropic 239:Isothermal 2197:− 2169:− 2135:− 2078:⁡ 2044:− 1943:∫ 1932:− 1883:∫ 1872:− 1825:− 1793:∫ 1782:− 1709:contains 1564:Waterston 1514:von Mayer 1469:de Donder 1459:Clapeyron 1439:Boltzmann 1434:Bernoulli 1395:Education 1366:Timelines 1150:− 1095:− 883:Equations 850:∂ 803:∂ 754:α 718:∂ 671:∂ 625:− 619:β 583:∂ 536:∂ 244:Adiabatic 234:Isochoric 220:Processes 181:Ideal gas 64:Classical 2219:See also 1732:friction 1684:pressure 1616:Category 1554:Thompson 1464:Clausius 1444:Bridgman 1298:Vis viva 1280:Theories 1214:Gas laws 1006:Enthalpy 414:Pressure 229:Isobaric 186:Real gas 74:Chemical 57:Branches 2225:Entropy 1539:Smeaton 1534:Rankine 1524:Onsager 1509:Maxwell 1504:Massieu 1209:Entropy 1204:General 1195:History 1185:Culture 1182:History 406: ( 403:Entropy 340:italics 141:Systems 2301:online 2270:  1968:where 1680:volume 1529:Planck 1519:Nernst 1494:Kelvin 1454:Carnot 744:  609:  477:  419:Volume 334:Note: 293:Cycles 122:Second 112:Zeroth 2028:, so 1668:quasi 1577:Other 1544:Stahl 1499:Lewis 1489:Joule 1479:Gibbs 1474:Duhem 167:State 127:Third 117:First 2268:ISBN 1755:and 1658:, a 1549:Tait 379:Heat 374:Work 104:Laws 1713:or 1654:In 1392:Art 338:in 2316:: 2119:, 2075:ln 1916:, 1856:, 1766:, 1701:, 1697:, 2303:. 2276:. 2200:1 2194:n 2187:2 2183:V 2177:2 2173:P 2164:1 2160:V 2154:1 2150:P 2143:= 2138:2 2132:1 2128:W 2098:1 2094:V 2088:2 2084:V 2070:1 2066:V 2060:1 2056:P 2052:= 2047:2 2041:1 2037:W 2016:C 2013:= 2008:1 2004:V 1998:1 1994:P 1990:= 1987:V 1984:P 1974:V 1970:P 1956:, 1953:V 1950:d 1946:P 1940:= 1935:2 1929:1 1925:W 1898:0 1895:= 1892:V 1889:d 1886:P 1880:= 1875:2 1869:1 1865:W 1838:) 1833:1 1829:V 1820:2 1816:V 1812:( 1809:P 1806:= 1803:V 1800:d 1796:P 1790:= 1785:2 1779:1 1775:W 1715:T 1711:P 1643:e 1636:t 1629:v 1156:S 1153:T 1147:H 1144:= 1141:) 1138:p 1135:, 1132:T 1129:( 1126:G 1101:S 1098:T 1092:U 1089:= 1086:) 1083:V 1080:, 1077:T 1074:( 1071:A 1046:V 1043:p 1040:+ 1037:U 1034:= 1031:) 1028:p 1025:, 1022:S 1019:( 1016:H 991:) 988:V 985:, 982:S 979:( 976:U 853:T 829:V 806:V 782:1 757:= 721:p 697:V 674:V 650:1 622:= 586:T 562:N 539:S 515:T 490:= 487:c 410:) 20:)

Index

Quasistatic equilibrium
Thermodynamics

Carnot heat engine
Classical
Statistical
Chemical
Quantum thermodynamics
Equilibrium
Non-equilibrium
Laws
Zeroth
First
Second
Third
Systems
Closed system
Open system
Isolated system
State
Equation of state
Ideal gas
Real gas
State of matter
Phase (matter)
Equilibrium
Control volume
Instruments
Processes
Isobaric

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