Knowledge

Avogadro's law

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The equation shows that, as the number of moles of gas increases, the volume of the gas also increases in proportion. Similarly, if the number of moles of gas is decreased, then the volume also decreases. Thus, the number of molecules or atoms in a specific volume of ideal gas is independent of their
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demonstrated that Avogadro's law explained why the same quantities of molecules in a gas have the same volume. Nevertheless, related experiments with some inorganic substances showed seeming exceptions to the law. This apparent contradiction was finally resolved by
1790: 1622: 2128:(1814). "Lettre de M. Ampère à M. le comte Berthollet sur la détermination des proportions dans lesquelles les corps se combinent d'après le nombre et la disposition respective des molécules dont les parties intégrantes sont composées". 1494:
in 1860, four years after Avogadro's death. He explained that these exceptions were due to molecular dissociations at certain temperatures, and that Avogadro's law determined not only molecular masses, but atomic masses as well.
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who, in 1812, hypothesized that two given samples of an ideal gas, of the same volume and at the same temperature and pressure, contain the same number of molecules. As an example, equal volumes of gaseous
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Avogadro, Amedeo (July 1811). "Essai d'une maniere de determiner les masses relatives des molecules elementaires des corps, et les proportions selon lesquelles elles entrent dans ces combinaisons".
1934:{\displaystyle V_{\text{m}}={\frac {V}{n}}={\frac {RT}{P}}\approx {\frac {\mathrm {8.3145\ {\frac {J}{mol\cdot K}}\times 273.15\ K} }{\mathrm {101.325\ kPa} }}\approx \mathrm {22.414\ L/mol} } 1178: 1766:{\displaystyle V_{\text{m}}={\frac {V}{n}}={\frac {RT}{P}}\approx {\frac {\mathrm {8.3145\ {\frac {J}{mol\cdot K}}\times 273.15\ K} }{\mathrm {100\ kPa} }}\approx \mathrm {22.711\ L/mol} } 80: 1286: 1222: 799: 760: 2028:"Essai d'une manière de déterminer les masses relatives des molécules élémentaires des corps, et les proportions selon lesquelles elles entrent dans ces combinaisons" 1093: 1398: 2225: 1454:
that some gases were composite of different fundamental substances (molecules) in integer proportions. In 1814, independently from Avogadro,
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show small deviations from the ideal behavior and the law holds only approximately, but is still a useful approximation for scientists.
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published the same law with similar conclusions. As Ampère was more well known in France, the hypothesis was usually referred there as
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in 1834, giving rise to the ideal gas law. At the end of the 19th century, later developments from scientists like
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Avogadro's law provides a way to calculate the quantity of gas in a receptacle. Thanks to this discovery,
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contain the same number of molecules when they are at the same temperature and pressure, and observe
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Relationship between volume and amount of a gas at constant temperature and pressure
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Boyle, Charles and Gay-Lussac laws, together with Avogadro's law, were combined by
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led to the definition of the Avogadro number as the number of molecules in one
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An equivalent formulation of the ideal gas law can be written using
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Avogadro's law states that "equal volumes of all gases, at the same
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Sitzungsberichte der Kaiserlichen Akademie der Wissenschaften Wien
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which is a constant for a fixed pressure and a fixed temperature.
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circled are variable and properties not circled are held constant)
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in 1834), one is able to determine the number of particles in a
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The derivation of Avogadro's law follows directly from the
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of substance. At the same time, precision experiments by
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is the number of particles in the gas, and the ratio of
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Journal de Physique, de Chimie, et d'Histoire Naturelle
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This law describes how, under the same condition of
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"Zur Grösse der LuftmolekĂĽle". 2147:Scheidecker-Chevallier, Myriam (1997). 2436: 2124: 2238: 839:for a given temperature and pressure. 1586:led to the modern definition of the 1530: 1473:Experimental studies carried out by 2098: 13: 1927: 1924: 1921: 1913: 1897: 1894: 1891: 1880: 1865: 1859: 1856: 1853: 1849: 1759: 1756: 1753: 1745: 1729: 1726: 1723: 1712: 1697: 1691: 1688: 1685: 1681: 1281:{\displaystyle PV=Nk_{\text{B}}T,} 14: 2460: 2264: 1606:standard temperature and pressure 1217:{\displaystyle k={\frac {RT}{P}}} 1046:Derivation from the ideal gas law 2195:Journal de l'École Polytechnique 1498: 1450:with the "incompatible" idea of 1427:Historical account and influence 794:{\displaystyle {\frac {V}{n}}=k} 2205: 2179: 1593: 2140: 2118: 2073: 2016: 1963: 1950: 1780:(101.325 kPa) and 0  1: 2153:Revue d'Histoire des Sciences 1979: 1778:standard atmospheric pressure 1584:International System of Units 655:Avogadro-Ampère's hypothesis 7: 859:contain the same number of 733:The law can be written as: 10: 2465: 1597: 1468:Ampère–Avogadro hypothesis 1464:Avogadro–Ampère hypothesis 755:{\displaystyle V\propto n} 685:, have the same number of 645:(sometimes referred to as 2390: 2372:Thermodynamic temperature 2299: 2273: 1475:Charles FrĂ©dĂ©ric Gerhardt 673:. A modern statement is: 1944: 825:of the gas (measured in 134:Clausius–Duhem (entropy) 84:Fick's laws of diffusion 2101:"Avogadro's Hypothesis" 2002:Encyclopædia Britannica 1525:kinetic theory of gases 1452:Joseph Louis Gay-Lussac 1317:is a constant, we have 1088:{\displaystyle PV=nRT,} 729:Mathematical definition 721:behavior. In practice, 704:The law is named after 692:For a given mass of an 292:Navier–Stokes equations 230:Material failure theory 1935: 1767: 1537:Johann Josef Loschmidt 1380: 1282: 1218: 1174: 1089: 1042: 949:Relationships between 928: 795: 756: 702: 76: 2165:10.3406/rhs.1997.1277 2105:Science World Wolfram 1936: 1768: 1558:; using it with the 1432:Avogadro's hypothesis 1381: 1283: 1219: 1175: 1090: 948: 929: 796: 757: 698:directly proportional 675: 647:Avogadro's hypothesis 287:Bernoulli's principle 280:Archimedes' principle 77: 1971:Stanislao Cannizzaro 1791: 1623: 1572:Jean Baptiste Perrin 1488:Stanislao Cannizzaro 1462:, and later also as 1448:Dalton atomic theory 1324: 1247: 1190: 1136: 1118:is the pressure (in 1061: 870: 772: 740: 651:Avogadro's principle 379:Cohesion (chemistry) 201:Infinitesimal strain 37: 2449:Amount of substance 2347:Amount of substance 2312:Molar concentration 2300:Physical quantities 2226:English translation 2126:Ampère, AndrĂ©-Marie 2041:English translation 2032:Journal de Physique 1958:Jean-Baptiste Dumas 1548:oil drop experiment 1523:, gave rise to the 1517:James Clerk Maxwell 1460:Ampère's hypothesis 823:amount of substance 667:amount of substance 657:is an experimental 297:Poiseuille equation 28:Continuum mechanics 22:Part of a series on 2307:Mass concentration 2286:Boltzmann constant 2060:Medical Dictionary 1931: 1763: 1541:Loschmidt constant 1492:Karlsruhe Congress 1490:, as announced at 1456:AndrĂ©-Marie Ampère 1421:Loschmidt constant 1376: 1313:In this form, for 1278: 1232:Boltzmann constant 1214: 1170: 1112:Kelvin temperature 1085: 1043: 977:Boltzmann constant 924: 791: 752: 503:Magnetorheological 498:Electrorheological 235:Fracture mechanics 72: 2431: 2430: 2281:Avogadro constant 2130:Annales de Chimie 1912: 1901: 1890: 1879: 1869: 1846: 1833: 1815: 1801: 1744: 1733: 1722: 1711: 1701: 1678: 1665: 1647: 1633: 1588:Avogadro constant 1531:Avogadro constant 1483:organic chemistry 1371: 1361: 1335: 1308:Avogadro constant 1269: 1212: 1165: 1147: 1129:, we thus obtain 922: 895: 783: 640: 639: 515: 514: 449: 448: 218:Contact mechanics 141: 140: 70: 2456: 2413:Combined gas law 2408:Gay-Lussac's law 2259: 2252: 2245: 2236: 2235: 2229: 2224: 2209: 2203: 2202: 2187:Clapeyron, Émile 2183: 2177: 2176: 2159:(1/2): 159–194. 2144: 2138: 2137: 2122: 2116: 2115: 2113: 2111: 2099:Rovnyak, David. 2096: 2090: 2089: 2077: 2071: 2070: 2068: 2066: 2053:"Avogadro's law" 2049: 2043: 2039: 2024:Avogadro, Amedeo 2020: 2014: 2013: 2011: 2009: 1997:"Avogadro's law" 1993: 1974: 1967: 1961: 1954: 1940: 1938: 1937: 1932: 1930: 1920: 1910: 1902: 1900: 1888: 1883: 1877: 1870: 1868: 1848: 1844: 1839: 1834: 1829: 1821: 1816: 1808: 1803: 1802: 1799: 1772: 1770: 1769: 1764: 1762: 1752: 1742: 1734: 1732: 1720: 1715: 1709: 1702: 1700: 1680: 1676: 1671: 1666: 1661: 1653: 1648: 1640: 1635: 1634: 1631: 1612:and 273.15  1560:Faraday constant 1521:Ludwig Boltzmann 1444:Gay-Lussac's law 1385: 1383: 1382: 1377: 1372: 1367: 1363: 1362: 1359: 1352: 1347: 1336: 1328: 1306:is equal to the 1287: 1285: 1284: 1279: 1271: 1270: 1267: 1223: 1221: 1220: 1215: 1213: 1208: 1200: 1183:Compare that to 1179: 1177: 1176: 1171: 1166: 1161: 1153: 1148: 1140: 1094: 1092: 1091: 1086: 1036: 1035: 1033: 1032: 1027: 1024: 1011: 1009: 1008: 998: 995: 974: 933: 931: 930: 925: 923: 921: 920: 911: 910: 901: 896: 894: 893: 884: 883: 874: 800: 798: 797: 792: 784: 776: 761: 759: 758: 753: 665:of a gas to the 632: 625: 618: 464: 463: 429:Gay-Lussac's law 419:Combined gas law 369:Capillary action 254: 253: 97: 96: 81: 79: 78: 73: 71: 69: 61: 53: 19: 18: 2464: 2463: 2459: 2458: 2457: 2455: 2454: 2453: 2434: 2433: 2432: 2427: 2386: 2382:Specific volume 2362:Particle number 2295: 2269: 2263: 2233: 2232: 2210: 2206: 2184: 2180: 2145: 2141: 2123: 2119: 2109: 2107: 2097: 2093: 2078: 2074: 2064: 2062: 2058:Merriam-Webster 2051: 2050: 2046: 2021: 2017: 2007: 2005: 1995: 1994: 1987: 1982: 1977: 1968: 1964: 1955: 1951: 1947: 1916: 1906: 1884: 1852: 1847: 1840: 1838: 1822: 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2418:Avogadro's law 2415: 2410: 2405: 2400: 2394: 2392: 2388: 2387: 2385: 2384: 2379: 2374: 2369: 2364: 2359: 2354: 2349: 2344: 2339: 2334: 2329: 2324: 2319: 2314: 2309: 2303: 2301: 2297: 2296: 2294: 2293: 2288: 2283: 2277: 2275: 2271: 2270: 2262: 2261: 2254: 2247: 2239: 2231: 2230: 2204: 2178: 2139: 2117: 2091: 2072: 2044: 2015: 1984: 1983: 1981: 1978: 1976: 1975: 1969:First used by 1962: 1956:First used by 1948: 1946: 1943: 1942: 1941: 1929: 1926: 1923: 1919: 1915: 1909: 1905: 1899: 1896: 1893: 1887: 1882: 1876: 1873: 1867: 1864: 1861: 1858: 1855: 1851: 1843: 1837: 1832: 1828: 1825: 1819: 1814: 1811: 1806: 1797: 1776:Similarly, at 1774: 1773: 1761: 1758: 1755: 1751: 1747: 1741: 1737: 1731: 1728: 1725: 1719: 1714: 1708: 1705: 1699: 1696: 1693: 1690: 1687: 1683: 1675: 1669: 1664: 1660: 1657: 1651: 1646: 1643: 1638: 1629: 1598:Main article: 1595: 1592: 1532: 1529: 1500: 1497: 1428: 1425: 1416: 1409: 1387: 1386: 1375: 1370: 1366: 1357: 1350: 1346: 1343: 1339: 1334: 1331: 1303: 1289: 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2106: 2102: 2095: 2087: 2084:(in French). 2083: 2076: 2061: 2059: 2054: 2048: 2042: 2037: 2033: 2029: 2025: 2019: 2004: 2003: 1998: 1992: 1990: 1985: 1972: 1966: 1959: 1953: 1949: 1917: 1907: 1903: 1885: 1874: 1871: 1862: 1841: 1835: 1830: 1826: 1823: 1817: 1812: 1809: 1804: 1795: 1787: 1786: 1785: 1783: 1779: 1749: 1739: 1735: 1717: 1706: 1703: 1694: 1673: 1667: 1662: 1658: 1655: 1649: 1644: 1641: 1636: 1627: 1619: 1618: 1617: 1615: 1611: 1607: 1601: 1591: 1589: 1585: 1581: 1577: 1576:gram-molecule 1573: 1569: 1565: 1561: 1557: 1553: 1549: 1546: 1542: 1538: 1528: 1526: 1522: 1518: 1514: 1510: 1509:August Krönig 1506: 1499:Ideal gas law 1496: 1493: 1489: 1484: 1480: 1476: 1471: 1469: 1465: 1461: 1457: 1453: 1449: 1445: 1441: 1440:Charles's law 1437: 1433: 1424: 1422: 1415: 1408: 1404: 1400: 1397:are taken at 1396: 1392: 1373: 1368: 1364: 1355: 1348: 1344: 1341: 1337: 1332: 1329: 1320: 1319: 1318: 1316: 1311: 1309: 1302: 1298: 1294: 1275: 1272: 1263: 1259: 1256: 1253: 1250: 1243: 1242: 1241: 1236: 1233: 1228: 1209: 1205: 1202: 1196: 1193: 1186: 1185: 1184: 1167: 1162: 1158: 1155: 1149: 1144: 1141: 1132: 1131: 1130: 1128: 1123: 1121: 1117: 1113: 1109: 1105: 1101: 1082: 1079: 1076: 1073: 1070: 1067: 1064: 1057: 1056: 1055: 1053: 1052:ideal gas law 1040: 978: 973: 968: 964: 960: 956: 952: 947: 943: 941: 917: 913: 907: 903: 897: 890: 886: 880: 876: 866: 865: 864: 862: 858: 854: 850: 846: 838: 834: 831: 828: 824: 820: 817: 814: 810: 807: 806: 805: 788: 785: 780: 777: 768: 767: 766: 749: 746: 743: 736: 735: 734: 726: 724: 720: 716: 712: 707: 701: 699: 695: 690: 688: 684: 680: 674: 672: 671:ideal gas law 668: 664: 661:relating the 660: 656: 652: 648: 644: 633: 628: 626: 621: 619: 614: 613: 611: 610: 602: 599: 597: 594: 592: 589: 587: 584: 582: 579: 577: 574: 572: 569: 567: 564: 562: 559: 557: 554: 552: 549: 547: 544: 542: 539: 537: 534: 532: 529: 528: 521: 520: 509: 506: 504: 501: 499: 496: 495: 494: 493: 490: 487: 486: 481: 478: 476: 473: 471: 468: 467: 466: 465: 460: 455: 454: 445: 442: 441: 435: 432: 430: 427: 425: 422: 420: 417: 415: 414:Charles's law 412: 410: 407: 405: 402: 401: 399: 398: 395: 392: 391: 385: 382: 380: 377: 375: 372: 370: 367: 365: 362: 361: 359: 358: 355: 352: 351: 345: 342: 338: 335: 331: 328: 323: 322:non-Newtonian 320: 316: 312: 311: 310: 307: 305: 302: 298: 295: 293: 290: 288: 285: 281: 278: 276: 273: 269: 266: 265: 263: 262: 259: 256: 255: 250: 245: 244: 236: 233: 231: 228: 224: 221: 220: 219: 216: 214: 211: 209: 208:Compatibility 206: 202: 199: 197: 196:Finite strain 194: 193: 192: 189: 187: 184: 182: 179: 177: 174: 170: 167: 166: 165: 162: 160: 157: 156: 152: 147: 146: 135: 132: 131: 130: 129: 125: 124: 119: 116: 114: 111: 109: 106: 105: 104: 103: 100:Conservations 99: 98: 90: 89: 85: 66: 63: 58: 55: 49: 46: 43: 40: 33: 32: 29: 26: 25: 21: 20: 2417: 2377:Molar volume 2291:Gas constant 2220: 2216: 2207: 2198: 2194: 2181: 2156: 2152: 2142: 2133: 2129: 2120: 2108:. 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Retrieved 2000: 1965: 1952: 1784:(273.15 K): 1775: 1603: 1600:Molar volume 1594:Molar volume 1562:(derived by 1534: 1502: 1472: 1467: 1463: 1459: 1442:(1787) and 1431: 1430: 1413: 1406: 1402: 1401:(STP), then 1394: 1390: 1388: 1314: 1312: 1300: 1296: 1292: 1290: 1234: 1229: 1226: 1182: 1126: 1125:Solving for 1124: 1115: 1107: 1104:gas constant 1099: 1097: 1049: 962: 959:Gay-Lussac's 942:of the gas. 938:size or the 936: 842: 832: 818: 808: 803: 764: 732: 703: 691: 676: 654: 650: 646: 642: 641: 489:Smart fluids 434:Graham's law 340: 333: 318: 304:Pascal's law 300: 283: 271: 126:Inequalities 2403:Boyle's law 2357:Atomic mass 2136:(1): 43–86. 1436:Boyle's law 975:, with the 845:temperature 815:of the gas; 679:temperature 508:Ferrofluids 409:Boyle's law 181:Hooke's law 159:Deformation 2438:Categories 2352:Molar mass 2201:: 153–190. 2110:3 February 2065:3 February 2008:3 February 1980:References 1608:(100  1545:Millikan's 1039:properties 963:Avogadro's 940:molar mass 723:real gases 561:Gay-Lussac 524:Scientists 424:Fick's law 404:Atmosphere 223:frictional 176:Plasticity 164:Elasticity 2274:Constants 1904:≈ 1872:× 1863:⋅ 1836:≈ 1736:≈ 1704:× 1695:⋅ 1668:≈ 955:Charles's 861:molecules 747:∝ 719:ideal gas 694:ideal gas 687:molecules 601:Truesdell 531:Bernoulli 480:Rheometer 475:Rheometry 315:Newtonian 309:Viscosity 59:φ 47:− 2444:Gas laws 2367:Pressure 2317:Molality 2268:concepts 2189:(1834). 2173:23633274 2088:: 58–76. 2038:: 58–76. 2026:(1810). 1973:in 1858. 1960:in 1826. 1556:electron 1466:or even 1438:(1662), 1412:, where 1345:′ 967:combined 851:, equal 849:pressure 837:constant 715:nitrogen 711:hydrogen 683:pressure 459:Rheology 364:Adhesion 344:Pressure 330:Buoyancy 275:Dynamics 113:Momentum 2332:Density 1886:101.325 1554:of the 1419:is the 1120:pascals 1110:is the 1102:is the 1054:, i.e. 1034:⁠ 1020:  1014:⁠ 1010:⁠ 989:⁠ 951:Boyle's 855:of all 853:volumes 821:is the 811:is the 659:gas law 546:Charles 354:Liquids 268:Statics 213:Bending 2327:Volume 2171:  1911:  1908:22.414 1889:  1878:  1875:273.15 1845:  1842:8.3145 1743:  1740:22.711 1721:  1710:  1707:273.15 1677:  1674:8.3145 1580:oxygen 1552:charge 1405:′ = 1/ 1291:where 1114:, and 1098:where 813:volume 804:where 663:volume 596:Stokes 591:Pascal 581:Navier 576:Newton 566:Graham 541:Cauchy 444:Plasma 339:  337:Mixing 332:  317:  299:  282:  270:  258:Fluids 191:Strain 186:Stress 169:linear 118:Energy 2169:JSTOR 1945:Notes 1299:over 1240:, as 857:gases 835:is a 827:moles 653:) or 571:Hooke 551:Euler 536:Boyle 394:Gases 2391:Laws 2322:Mass 2266:Mole 2112:2016 2067:2016 2010:2016 1568:mole 1519:and 1477:and 1393:and 969:and 847:and 713:and 681:and 586:Noll 556:Fick 108:Mass 93:Laws 2199:XIV 2161:doi 1718:100 1610:kPa 1604:At 1578:of 1481:on 1389:If 1315:V/N 1127:V/n 1122:). 765:or 689:." 649:or 2440:: 2221:52 2219:. 2193:. 2167:. 2157:50 2151:. 2134:90 2103:. 2086:73 2055:. 2036:73 2034:. 2030:. 1999:. 1988:^ 1782:°C 1590:. 1515:, 1511:, 1470:. 1423:. 1310:. 1106:, 1012:= 987:= 965:, 961:, 957:, 953:, 829:); 2258:e 2251:t 2244:v 2228:. 2175:. 2163:: 2114:. 2069:. 2012:. 1928:l 1925:o 1922:m 1918:/ 1914:L 1898:a 1895:P 1892:k 1881:K 1866:K 1860:l 1857:o 1854:m 1850:J 1831:P 1827:T 1824:R 1818:= 1813:n 1810:V 1805:= 1800:m 1796:V 1760:l 1757:o 1754:m 1750:/ 1746:L 1730:a 1727:P 1724:k 1713:K 1698:K 1692:l 1689:o 1686:m 1682:J 1663:P 1659:T 1656:R 1650:= 1645:n 1642:V 1637:= 1632:m 1628:V 1614:K 1417:0 1414:n 1410:0 1407:n 1403:k 1395:P 1391:T 1374:. 1369:P 1365:T 1360:B 1356:k 1349:= 1342:k 1338:= 1333:N 1330:V 1304:B 1301:k 1297:R 1293:N 1276:, 1273:T 1268:B 1264:k 1260:N 1257:= 1254:V 1251:P 1238:B 1235:k 1210:P 1206:T 1203:R 1197:= 1194:k 1168:. 1163:P 1159:T 1156:R 1150:= 1145:n 1142:V 1116:P 1108:T 1100:R 1083:, 1080:T 1077:R 1074:n 1071:= 1068:V 1065:P 1030:N 1026:/ 1022:R 1018:n 1005:A 1001:N 997:/ 993:R 981:k 918:2 914:n 908:2 904:V 898:= 891:1 887:n 881:1 877:V 833:k 819:n 809:V 789:k 786:= 781:n 778:V 750:n 744:V 631:e 624:t 617:v 341:· 334:· 324:) 319:· 313:( 301:· 284:· 272:· 67:x 64:d 56:d 50:D 44:= 41:J

Index

Continuum mechanics
Fick's laws of diffusion
Mass
Momentum
Energy
Clausius–Duhem (entropy)
Solid mechanics
Deformation
Elasticity
linear
Plasticity
Hooke's law
Stress
Strain
Finite strain
Infinitesimal strain
Compatibility
Bending
Contact mechanics
frictional
Material failure theory
Fracture mechanics
Fluid mechanics
Fluids
Statics
Dynamics
Archimedes' principle
Bernoulli's principle
Navier–Stokes equations
Poiseuille equation

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