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Thermal fluctuations

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complexions that is compatible with a given macroscopic state. It is this quantity that Planck referred to as a 'thermodynamic' probability. It differs from a classical probability inasmuch as it cannot be normalized; that is, its integral over all energies diverges—but it diverges as a power of the energy and not faster. Since its integral over all energies is infinite, we might try to consider its Laplace transform
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will belong to the family of exponential distributions known as gamma densities. Consequently, the canonical probability density falls under the jurisdiction of the local law of large numbers which asserts that a sequence of independent and identically distributed random variables tends to the normal
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has its legs in two worlds: (i) the macroscopic one in which it is considered a function of the energy, and the other extensive variables, like the volume, that have been held constant in the differentiation of the phase volume, and (ii) the microscopic world where it represents the number of
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on the surface of a crystal. The shaking of the atoms is an example of thermal fluctuations. Likewise, thermal fluctuations provide the energy necessary for the atoms to occasionally hop from one site to a neighboring one. For simplicity, the thermal fluctuations of the blue atoms are not
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are random deviations of an atomic system from its average state, that occur in a system at equilibrium. All thermal fluctuations become larger and more frequent as the temperature increases, and likewise they decrease as temperature approaches
3924: 3399: 1620: 905: 761: 2144: 4052: 3517: 3748: 3585: 1114:{\displaystyle \langle E\rangle =-{\frac {\partial \ln {\mathcal {Z}}}{\partial \beta }},\qquad \ \langle (E-\langle E\rangle )^{2}\rangle =(\Delta E)^{2}={\frac {\partial ^{2}\ln {\mathcal {Z}}}{\partial \beta ^{2}}},} 1881: 400: 2619: 1812: 1453:{\displaystyle f(E;\beta )={\frac {e^{-\beta E}}{{\mathcal {Z}}(\beta )}}\Omega (E)\approx {\frac {\exp\{-(E-\langle E\rangle )^{2}/2\langle (\Delta E)^{2}\rangle \}}{\sqrt {2\pi (\Delta E)^{2}}}}.} 2350: 2326: 3256: 813:. Most of the contribution to the integral will come from an immediate neighborhood about this value of the energy. This enables the definition of a proper probability density according to 3013: 2869: 943:, which is referred to as the partition function, or generating function. The latter name is due to the fact that the derivatives of its logarithm generate the central moments, namely, 474: 636: 2818:{\displaystyle w=\prod _{i,j=1\ldots n}{\frac {1}{\left(2\pi \right)^{n/2}{\sqrt {\langle x_{i}x_{j}\rangle }}}}\exp \left(-{\frac {x_{i}x_{j}}{2\langle x_{i}x_{j}\rangle }}\right),} 1199: 941: 2501: 1612: 105:
of systems: A system at nonzero temperature does not stay in its equilibrium microscopic state, but instead randomly samples all possible states, with probabilities given by the
1889: 1225: 134:, likewise undergo thermal fluctuations. For example, for a system that has an equilibrium pressure, the system pressure fluctuates to some extent about the equilibrium value. 3788: 319: 2039: 218: 3960: 3621: 3680: 3310: 1749:{\displaystyle \Omega (\langle E\rangle )={\frac {e^{\beta (\langle E\rangle )\langle E\rangle }{\mathcal {Z}}(\beta (\langle E\rangle ))}{\sqrt {2\pi (\Delta E)^{2}}}}.} 1580: 1496: 285: 2906: 1463:
This is the Gaussian, or normal, distribution, which is defined by its first two moments. In general, one would need all the moments to specify the probability density,
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and the momentum space volume. Since the energy is a quadratic form of the momenta for a non-relativistic system, the radius of momentum space will be
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is a positive parameter, will overpower the rapidly increasing surface area so that an enormously sharp peak will develop at a certain energy
4075: 1817: 327: 2514: 2041:, and if the structure function retains the same functional dependency for all values of the energy, the canonical probability density, 1883:. Introducing these two expressions into the expression of the structure function evaluated at the mean value of the energy leads to 4224: 4201: 4178: 60: 1762: 2460:{\displaystyle w(x)={\frac {1}{\sqrt {2\pi \langle x^{2}\rangle }}}\exp \left(-{\frac {x^{2}}{2\langle x^{2}\rangle }}\right).} 177: 1156:
increases no faster than a power of the energy ensures that these moments will be finite. Therefore, we can expand the factor
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for Gaussian fluctuations (i.e. average and most probable values coincide), and retaining lowest order terms result in
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in any small part of a body. The small part must still be large enough, however, to have negligible quantum effects.
33: 575:{\displaystyle \Omega (E)={\frac {\partial {\mathcal {V}}}{\partial E}}={\frac {C^{m}\cdot E^{m-1}}{\Gamma (m)}},} 2975: 2831: 2158:
The expressions given below are for systems that are close to equilibrium and have negligible quantum effects.
588: 1159: 913: 150: 2473: 1986:{\displaystyle \Omega (\langle E\rangle )={\frac {\langle E\rangle ^{m-1}m}{{\sqrt {2\pi m}}m^{m}e^{-m}}}} 127: 106: 1585: 4100: 2340: 1519: 86: 1204: 3754: 290: 2000: 468:, which is the usual case in thermodynamics, essentially all the volume will lie near to the surface 199: 39: 4065: 3930: 3591: 2336: 1124:
and so on, where the first term is the mean energy and the second one is the dispersion in energy.
73: 3919:{\displaystyle {\frac {k_{\rm {B}}}{C_{V}}}T^{2}\left({\frac {\partial P}{\partial T}}\right)_{V}} 3653: 3394:{\displaystyle {\frac {k_{\rm {B}}}{C_{V}}}T^{2}\left({\frac {\partial P}{\partial T}}\right)_{V}} 3283: 4193: 4170: 4080: 1555: 1466: 266: 2874: 1498:, which is referred to as the canonical, or posterior, density in contrast to the prior density 1230: 1130: 789: 644: 160:
in many systems. The random forces that give rise to thermal fluctuations are a source of both
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The above expression has a straightforward generalization to the probability distribution
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In the table below are given the mean square fluctuations of the thermodynamic variables
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is the Gamma function. In the case that this hypersphere has a very high dimensionality,
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Only the 'control variables' of statistical ensembles (such as the number of particules
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which can be given a physical interpretation. The exponential decreasing factor, where
408: 246: 4238: 4163: 3074: 3043: 900:{\displaystyle f(E;\beta )={\frac {e^{-\beta E}}{{\mathcal {Z}}(\beta )}}\Omega (E),} 756:{\displaystyle {\mathcal {Z}}(\beta )=\int _{0}^{\infty }e^{-\beta E}\Omega (E)\,dE,} 169: 95: 176:). The competing effects of random drift and resistance to drift are related by the 2139:{\displaystyle f(E;\beta )=\beta {\frac {(\beta E)^{m-1}}{\Gamma (m)}}e^{-\beta E}} 165: 102: 910:
whose integral over all energies is unity on the strength of the definition of
4047:{\displaystyle -k_{\rm {B}}T\left({\frac {\partial P}{\partial V}}\right)_{S}} 3512:{\displaystyle -k_{\rm {B}}T\left({\frac {\partial V}{\partial P}}\right)_{T}} 16:
Random temperature-influenced deviations of particles from their average state
3743:{\displaystyle k_{\rm {B}}T\left({\frac {\partial V}{\partial T}}\right)_{P}} 3580:{\displaystyle k_{\rm {B}}T\left({\frac {\partial V}{\partial T}}\right)_{P}} 173: 161: 425:
is a constant depending upon the specific properties of the system and
131: 1876:{\displaystyle \langle (\Delta E)^{2}\rangle =\langle E\rangle ^{2}/m} 395:{\displaystyle {\mathcal {V}}={\frac {(C\cdot E)^{m}}{\Gamma (m+1)}},} 2614:{\displaystyle w(x_{1},x_{2},\ldots ,x_{n})dx_{1}dx_{2}\ldots dx_{n}} 117: 157: 121: 72: 1518:, which is referred to as the 'structure' function. This is the 1552:, its Laplace transform, the partition function, will vary as 243:
degrees of freedom is the product of the configuration volume
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18: 1807:{\displaystyle \beta (\langle E\rangle )=m/\langle E\rangle } 1684: 1306: 1085: 982: 919: 865: 683: 501: 333: 205: 2186:
is a thermodynamic variable. The probability distribution
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Fluctuations of the fundamental thermodynamic quantities
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The denominator is exactly Stirling's approximation for
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It follows from the expression of the first moment that
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Thermal fluctuations are a basic manifestation of the
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Thermal fluctuations play a major role in 4111: 4109: 3008:{\displaystyle \langle x_{i}x_{j}\rangle } 2864:{\displaystyle \langle x_{i}x_{j}\rangle } 4038: 4014: 3999: 3998: 3989: 3968: 3942: 3941: 3932: 3910: 3886: 3875: 3863: 3852: 3851: 3845: 3843: 3819: 3796: 3774: 3763: 3762: 3756: 3734: 3710: 3695: 3694: 3688: 3662: 3661: 3655: 3631: 3603: 3602: 3593: 3571: 3547: 3532: 3531: 3525: 3503: 3479: 3464: 3463: 3454: 3433: 3409: 3385: 3361: 3350: 3338: 3327: 3326: 3320: 3318: 3292: 3291: 3285: 3264: 3242: 3230: 3219: 3218: 3212: 3210: 3186: 3160: 3136: 3112: 3088: 3057: 3051: 3026: 3020: 2996: 2986: 2977: 2953: 2921: 2892: 2882: 2876: 2852: 2842: 2833: 2795: 2785: 2767: 2757: 2750: 2722: 2712: 2703: 2693: 2689: 2666: 2642: 2630: 2605: 2589: 2576: 2560: 2541: 2528: 2516: 2484: 2475: 2437: 2420: 2414: 2388: 2369: 2352: 2270: 2246: 2226: 2191: 2171: 2124: 2091: 2075: 2049: 2002: 1971: 1961: 1944: 1927: 1914: 1891: 1865: 1859: 1837: 1819: 1790: 1764: 1734: 1683: 1682: 1652: 1645: 1622: 1587: 1563: 1557: 1536: 1530: 1503: 1468: 1438: 1405: 1381: 1375: 1338: 1305: 1304: 1291: 1285: 1262: 1238: 1232: 1206: 1167: 1161: 1132: 1099: 1084: 1083: 1071: 1064: 1055: 1030: 981: 980: 968: 951: 918: 917: 915: 864: 863: 850: 844: 821: 797: 791: 771: 743: 719: 709: 704: 682: 681: 679: 646: 590: 540: 527: 520: 500: 499: 493: 476: 450: 430: 410: 360: 341: 332: 331: 329: 302: 295: 292: 270: 268: 248: 225: 204: 203: 201: 61:Learn how and when to remove this message 4140: 4138: 4136: 4134: 4115: 2970: 2335:about its maximum (corresponding to the 1814:, while from the second central moment, 1522:as it applies to thermodynamic systems. 631:{\displaystyle m\Gamma (m)=\Gamma (m+1)} 4211:Landau, L. D.; Lifshitz, E. M. (1985). 4126: 4092: 4076:Stochastic Eulerian Lagrangian methods 1194:{\displaystyle e^{-\beta E}\Omega (E)} 936:{\displaystyle {\mathcal {Z}}(\beta )} 3814: 3626: 3404: 3181: 3081: 2496:{\displaystyle \langle x^{2}\rangle } 156:Thermal fluctuations are a source of 7: 585:where we used the recursion formula 130:, such as pressure, temperature, or 2339:state), the lowest order term is a 1607:{\displaystyle E=\langle E\rangle } 4025: 4017: 4000: 3943: 3897: 3889: 3853: 3821: 3764: 3721: 3713: 3696: 3663: 3633: 3604: 3558: 3550: 3533: 3490: 3482: 3465: 3411: 3372: 3364: 3328: 3293: 3220: 3188: 3162: 3138: 3114: 3090: 2105: 2013: 1893: 1827: 1724: 1624: 1505: 1428: 1395: 1323: 1179: 1134: 1092: 1068: 1045: 989: 971: 882: 731: 710: 648: 610: 595: 554: 508: 496: 478: 432: 368: 14: 1525:If the phase volume increases as 1220:{\displaystyle \langle E\rangle } 3783:{\displaystyle k_{\rm {B}}C_{P}} 2503:is the mean square fluctuation. 314:{\displaystyle {\sqrt {E}}^{2m}} 23: 3015:of thermodynamic fluctuations. 2034:{\displaystyle m!=\Gamma (m+1)} 1001: 178:fluctuation-dissipation theorem 2566: 2521: 2363: 2357: 2307: 2301: 2281: 2275: 2202: 2196: 2154:Distribution about equilibrium 2114: 2108: 2088: 2078: 2066: 2054: 2028: 2016: 1908: 1896: 1834: 1824: 1781: 1769: 1731: 1721: 1710: 1707: 1695: 1689: 1668: 1656: 1639: 1627: 1485: 1473: 1435: 1425: 1402: 1392: 1372: 1353: 1332: 1326: 1317: 1311: 1279: 1267: 1188: 1182: 1143: 1137: 1052: 1042: 1027: 1008: 930: 924: 891: 885: 876: 870: 838: 826: 740: 734: 694: 688: 657: 651: 625: 613: 604: 598: 563: 557: 487: 481: 383: 371: 357: 344: 213:{\displaystyle {\mathcal {V}}} 1: 3955:{\displaystyle -k_{\rm {B}}T} 3616:{\displaystyle -k_{\rm {B}}T} 2241:is determined by the entropy 3675:{\displaystyle k_{\rm {B}}T} 3305:{\displaystyle k_{\rm {B}}T} 4213:Statistical Physics, Part 1 1575:{\displaystyle \beta ^{-m}} 1491:{\displaystyle f(E;\beta )} 1227:, which will coincide with 280:{\displaystyle {\sqrt {E}}} 4261: 4145:Landau & Lifshitz 1985 2901:{\displaystyle x_{i}x_{j}} 1247:{\displaystyle E^{\star }} 1149:{\displaystyle \Omega (E)} 806:{\displaystyle E^{\star }} 663:{\displaystyle \Omega (E)} 220:, occupied by a system of 196:The volume of phase space 321:giving a phase volume of 4161:Khinchin, A. I. (1949). 3830:{\displaystyle \Delta P} 3642:{\displaystyle \Delta S} 3420:{\displaystyle \Delta V} 3197:{\displaystyle \Delta T} 3171:{\displaystyle \Delta P} 3147:{\displaystyle \Delta S} 3123:{\displaystyle \Delta V} 3099:{\displaystyle \Delta T} 145:and the internal energy 4188:Lavenda, B. H. (1991). 1511:{\displaystyle \Omega } 438:{\displaystyle \Gamma } 151:microcanonical ensemble 128:Thermodynamic variables 32:This article cites its 4048: 3977: 3956: 3920: 3831: 3805: 3784: 3744: 3676: 3643: 3617: 3581: 3513: 3442: 3421: 3395: 3306: 3273: 3252: 3198: 3172: 3148: 3124: 3100: 3067: 3046:at constant pressure; 3036: 3009: 2962: 2942: 2902: 2865: 2819: 2615: 2497: 2461: 2322: 2255: 2235: 2215: 2214:{\displaystyle w(x)dx} 2180: 2140: 2035: 1987: 1877: 1808: 1750: 1608: 1576: 1546: 1512: 1492: 1454: 1248: 1221: 1195: 1150: 1115: 937: 901: 807: 780: 779:{\displaystyle \beta } 757: 664: 632: 576: 462: 439: 419: 396: 315: 281: 257: 237: 214: 107:Boltzmann distribution 82: 4245:Statistical mechanics 4101:statistical mechanics 4049: 3978: 3957: 3921: 3832: 3806: 3785: 3745: 3677: 3644: 3618: 3582: 3514: 3443: 3422: 3396: 3307: 3274: 3253: 3199: 3173: 3149: 3125: 3101: 3068: 3066:{\displaystyle C_{V}} 3037: 3035:{\displaystyle C_{P}} 3010: 2963: 2943: 2941:{\displaystyle T,V,P} 2903: 2871:is the mean value of 2866: 2820: 2616: 2498: 2462: 2341:Gaussian distribution 2323: 2256: 2236: 2216: 2181: 2141: 2036: 1988: 1878: 1809: 1751: 1609: 1577: 1547: 1545:{\displaystyle E^{m}} 1520:central limit theorem 1513: 1493: 1455: 1249: 1222: 1201:about the mean value 1196: 1151: 1116: 938: 902: 808: 781: 758: 665: 633: 577: 463: 440: 420: 397: 316: 282: 258: 238: 215: 192:Central limit theorem 120:), random rotations ( 87:statistical mechanics 76: 4066:Quantum fluctuations 3988: 3967: 3931: 3842: 3818: 3795: 3755: 3687: 3654: 3630: 3592: 3524: 3453: 3432: 3408: 3317: 3284: 3263: 3209: 3185: 3159: 3135: 3111: 3087: 3077:at constant volume. 3050: 3019: 2976: 2952: 2920: 2875: 2832: 2629: 2515: 2474: 2351: 2269: 2245: 2225: 2190: 2170: 2048: 2001: 1890: 1818: 1763: 1621: 1586: 1556: 1529: 1502: 1467: 1261: 1231: 1205: 1160: 1131: 950: 914: 820: 790: 770: 678: 645: 589: 475: 449: 429: 409: 328: 291: 267: 247: 224: 200: 153:) do not fluctuate. 91:thermal fluctuations 3078: 714: 4194:Wiley-Interscience 4171:Dover Publications 4081:Stokesian dynamics 4044: 3973: 3952: 3916: 3827: 3801: 3780: 3740: 3672: 3639: 3613: 3577: 3509: 3438: 3417: 3391: 3302: 3269: 3248: 3194: 3168: 3144: 3120: 3096: 3063: 3032: 3005: 2971: 2958: 2938: 2898: 2861: 2815: 2665: 2611: 2507:Multiple variables 2493: 2457: 2331:If the entropy is 2318: 2251: 2231: 2211: 2176: 2136: 2031: 1983: 1873: 1804: 1746: 1604: 1572: 1542: 1508: 1488: 1450: 1244: 1217: 1191: 1146: 1111: 933: 897: 803: 776: 753: 700: 660: 628: 572: 461:{\displaystyle 2m} 458: 435: 415: 392: 311: 277: 253: 236:{\displaystyle 2m} 233: 210: 114:degrees of freedom 83: 4057: 4056: 4032: 3976:{\displaystyle 0} 3904: 3869: 3804:{\displaystyle 0} 3728: 3565: 3497: 3441:{\displaystyle 0} 3379: 3344: 3272:{\displaystyle 0} 3236: 2961:{\displaystyle S} 2805: 2734: 2731: 2638: 2447: 2398: 2397: 2254:{\displaystyle S} 2234:{\displaystyle x} 2179:{\displaystyle x} 2118: 1981: 1955: 1741: 1740: 1445: 1444: 1321: 1106: 1004: 996: 880: 641:The surface area 567: 515: 418:{\displaystyle C} 387: 300: 275: 256:{\displaystyle V} 186:chemical kinetics 182:phase transitions 71: 70: 63: 38:does not provide 4252: 4230: 4215:(3rd ed.). 4207: 4184: 4168: 4147: 4142: 4129: 4124: 4118: 4113: 4104: 4097: 4053: 4051: 4050: 4045: 4043: 4042: 4037: 4033: 4031: 4023: 4015: 4005: 4004: 4003: 3982: 3980: 3979: 3974: 3961: 3959: 3958: 3953: 3948: 3947: 3946: 3925: 3923: 3922: 3917: 3915: 3914: 3909: 3905: 3903: 3895: 3887: 3880: 3879: 3870: 3868: 3867: 3858: 3857: 3856: 3846: 3836: 3834: 3833: 3828: 3810: 3808: 3807: 3802: 3789: 3787: 3786: 3781: 3779: 3778: 3769: 3768: 3767: 3749: 3747: 3746: 3741: 3739: 3738: 3733: 3729: 3727: 3719: 3711: 3701: 3700: 3699: 3681: 3679: 3678: 3673: 3668: 3667: 3666: 3648: 3646: 3645: 3640: 3622: 3620: 3619: 3614: 3609: 3608: 3607: 3586: 3584: 3583: 3578: 3576: 3575: 3570: 3566: 3564: 3556: 3548: 3538: 3537: 3536: 3518: 3516: 3515: 3510: 3508: 3507: 3502: 3498: 3496: 3488: 3480: 3470: 3469: 3468: 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2502: 2500: 2499: 2494: 2489: 2488: 2466: 2464: 2463: 2458: 2453: 2449: 2448: 2446: 2442: 2441: 2425: 2424: 2415: 2399: 2393: 2392: 2374: 2370: 2327: 2325: 2324: 2319: 2314: 2310: 2260: 2258: 2257: 2252: 2240: 2238: 2237: 2232: 2220: 2218: 2217: 2212: 2185: 2183: 2182: 2177: 2145: 2143: 2142: 2137: 2135: 2134: 2119: 2117: 2103: 2102: 2101: 2076: 2040: 2038: 2037: 2032: 1992: 1990: 1989: 1984: 1982: 1980: 1979: 1978: 1966: 1965: 1956: 1945: 1942: 1938: 1937: 1915: 1882: 1880: 1879: 1874: 1869: 1864: 1863: 1842: 1841: 1813: 1811: 1810: 1805: 1794: 1755: 1753: 1752: 1747: 1742: 1739: 1738: 1714: 1713: 1688: 1687: 1681: 1680: 1646: 1613: 1611: 1610: 1605: 1581: 1579: 1578: 1573: 1571: 1570: 1551: 1549: 1548: 1543: 1541: 1540: 1517: 1515: 1514: 1509: 1497: 1495: 1494: 1489: 1459: 1457: 1456: 1451: 1446: 1443: 1442: 1418: 1417: 1410: 1409: 1385: 1380: 1379: 1339: 1322: 1320: 1310: 1309: 1302: 1301: 1286: 1253: 1251: 1250: 1245: 1243: 1242: 1226: 1224: 1223: 1218: 1200: 1198: 1197: 1192: 1178: 1177: 1155: 1153: 1152: 1147: 1120: 1118: 1117: 1112: 1107: 1105: 1104: 1103: 1090: 1089: 1088: 1076: 1075: 1065: 1060: 1059: 1035: 1034: 1002: 997: 995: 987: 986: 985: 969: 942: 940: 939: 934: 923: 922: 906: 904: 903: 898: 881: 879: 869: 868: 861: 860: 845: 812: 810: 809: 804: 802: 801: 785: 783: 782: 777: 762: 760: 759: 754: 730: 729: 713: 708: 687: 686: 669: 667: 666: 661: 637: 635: 634: 629: 581: 579: 578: 573: 568: 566: 552: 551: 550: 532: 531: 521: 516: 514: 506: 505: 504: 494: 467: 465: 464: 459: 444: 442: 441: 436: 424: 422: 421: 416: 401: 399: 398: 393: 388: 386: 366: 365: 364: 342: 337: 336: 320: 318: 317: 312: 310: 309: 301: 296: 286: 284: 283: 278: 276: 271: 262: 260: 259: 254: 242: 240: 239: 234: 219: 217: 216: 211: 209: 208: 78:Atomic diffusion 66: 59: 55: 52: 46: 27: 26: 19: 4260: 4259: 4255: 4254: 4253: 4251: 4250: 4249: 4235: 4234: 4233: 4227: 4210: 4204: 4187: 4181: 4160: 4156: 4151: 4150: 4143: 4132: 4125: 4121: 4114: 4107: 4098: 4094: 4089: 4071:Brownian Motion 4062: 4024: 4016: 4010: 4009: 3994: 3986: 3985: 3965: 3964: 3937: 3929: 3928: 3896: 3888: 3882: 3881: 3871: 3859: 3847: 3840: 3839: 3816: 3815: 3793: 3792: 3770: 3758: 3753: 3752: 3720: 3712: 3706: 3705: 3690: 3685: 3684: 3657: 3652: 3651: 3628: 3627: 3598: 3590: 3589: 3557: 3549: 3543: 3542: 3527: 3522: 3521: 3489: 3481: 3475: 3474: 3459: 3451: 3450: 3430: 3429: 3406: 3405: 3371: 3363: 3357: 3356: 3346: 3334: 3322: 3315: 3314: 3287: 3282: 3281: 3261: 3260: 3238: 3226: 3214: 3207: 3206: 3183: 3182: 3157: 3156: 3133: 3132: 3109: 3108: 3085: 3084: 3053: 3048: 3047: 3022: 3017: 3016: 2992: 2982: 2974: 2973: 2950: 2949: 2918: 2917: 2914: 2888: 2878: 2873: 2872: 2848: 2838: 2830: 2829: 2791: 2781: 2774: 2763: 2753: 2752: 2746: 2742: 2718: 2708: 2677: 2673: 2672: 2671: 2627: 2626: 2622: 2601: 2585: 2572: 2556: 2537: 2524: 2513: 2512: 2509: 2480: 2472: 2471: 2433: 2426: 2416: 2410: 2406: 2384: 2349: 2348: 2344: 2333:Taylor expanded 2297: 2293: 2267: 2266: 2262: 2243: 2242: 2223: 2222: 2188: 2187: 2168: 2167: 2164: 2162:Single variable 2156: 2120: 2104: 2087: 2077: 2046: 2045: 1999: 1998: 1967: 1957: 1943: 1923: 1916: 1888: 1887: 1855: 1833: 1816: 1815: 1761: 1760: 1730: 1648: 1647: 1619: 1618: 1584: 1583: 1559: 1554: 1553: 1532: 1527: 1526: 1500: 1499: 1465: 1464: 1434: 1401: 1371: 1340: 1303: 1287: 1259: 1258: 1234: 1229: 1228: 1203: 1202: 1163: 1158: 1157: 1129: 1128: 1095: 1091: 1067: 1066: 1051: 1026: 988: 970: 948: 947: 912: 911: 862: 846: 818: 817: 793: 788: 787: 768: 767: 715: 676: 675: 643: 642: 587: 586: 553: 536: 523: 522: 507: 495: 473: 472: 447: 446: 427: 426: 407: 406: 367: 356: 343: 326: 325: 294: 289: 288: 265: 264: 245: 244: 222: 221: 198: 197: 194: 67: 56: 50: 47: 44: 40:page references 28: 24: 17: 12: 11: 5: 4258: 4256: 4248: 4247: 4237: 4236: 4232: 4231: 4225: 4217:Pergamon Press 4208: 4202: 4185: 4179: 4157: 4155: 4152: 4149: 4148: 4130: 4119: 4105: 4091: 4090: 4088: 4085: 4084: 4083: 4078: 4073: 4068: 4061: 4058: 4055: 4054: 4041: 4036: 4030: 4027: 4022: 4019: 4013: 4008: 4002: 3997: 3993: 3983: 3972: 3962: 3951: 3945: 3940: 3936: 3926: 3913: 3908: 3902: 3899: 3894: 3891: 3885: 3878: 3874: 3866: 3862: 3855: 3850: 3837: 3826: 3823: 3812: 3811: 3800: 3790: 3777: 3773: 3766: 3761: 3750: 3737: 3732: 3726: 3723: 3718: 3715: 3709: 3704: 3698: 3693: 3682: 3671: 3665: 3660: 3649: 3638: 3635: 3624: 3623: 3612: 3606: 3601: 3597: 3587: 3574: 3569: 3563: 3560: 3555: 3552: 3546: 3541: 3535: 3530: 3519: 3506: 3501: 3495: 3492: 3487: 3484: 3478: 3473: 3467: 3462: 3458: 3448: 3437: 3427: 3416: 3413: 3402: 3401: 3388: 3383: 3377: 3374: 3369: 3366: 3360: 3353: 3349: 3341: 3337: 3330: 3325: 3312: 3301: 3295: 3290: 3279: 3268: 3258: 3245: 3241: 3233: 3229: 3222: 3217: 3204: 3193: 3190: 3179: 3178: 3167: 3164: 3154: 3143: 3140: 3130: 3119: 3116: 3106: 3095: 3092: 3082: 3060: 3056: 3029: 3025: 3004: 2999: 2995: 2989: 2985: 2981: 2957: 2937: 2934: 2931: 2928: 2925: 2913: 2910: 2895: 2891: 2885: 2881: 2860: 2855: 2851: 2845: 2841: 2837: 2826: 2825: 2814: 2810: 2803: 2798: 2794: 2788: 2784: 2780: 2777: 2770: 2766: 2760: 2756: 2749: 2745: 2741: 2738: 2730: 2725: 2721: 2715: 2711: 2707: 2700: 2696: 2692: 2687: 2683: 2680: 2676: 2670: 2663: 2660: 2657: 2654: 2651: 2648: 2645: 2641: 2637: 2634: 2608: 2604: 2600: 2597: 2592: 2588: 2584: 2579: 2575: 2571: 2568: 2563: 2559: 2555: 2552: 2549: 2544: 2540: 2536: 2531: 2527: 2523: 2520: 2508: 2505: 2492: 2487: 2483: 2479: 2468: 2467: 2456: 2452: 2445: 2440: 2436: 2432: 2429: 2423: 2419: 2413: 2409: 2405: 2402: 2396: 2391: 2387: 2383: 2380: 2377: 2373: 2368: 2365: 2362: 2359: 2356: 2329: 2328: 2317: 2313: 2309: 2306: 2303: 2300: 2296: 2292: 2289: 2286: 2283: 2280: 2277: 2274: 2250: 2230: 2210: 2207: 2204: 2201: 2198: 2195: 2175: 2163: 2160: 2155: 2152: 2147: 2146: 2133: 2130: 2127: 2123: 2116: 2113: 2110: 2107: 2100: 2097: 2094: 2090: 2086: 2083: 2080: 2074: 2071: 2068: 2065: 2062: 2059: 2056: 2053: 2030: 2027: 2024: 2021: 2018: 2015: 2012: 2009: 2006: 1995: 1994: 1977: 1974: 1970: 1964: 1960: 1954: 1951: 1948: 1941: 1936: 1933: 1930: 1926: 1922: 1919: 1913: 1910: 1907: 1904: 1901: 1898: 1895: 1872: 1868: 1862: 1858: 1854: 1851: 1848: 1845: 1840: 1836: 1832: 1829: 1826: 1823: 1803: 1800: 1797: 1793: 1789: 1786: 1783: 1780: 1777: 1774: 1771: 1768: 1757: 1756: 1745: 1737: 1733: 1729: 1726: 1723: 1720: 1717: 1712: 1709: 1706: 1703: 1700: 1697: 1694: 1691: 1686: 1679: 1676: 1673: 1670: 1667: 1664: 1661: 1658: 1655: 1651: 1644: 1641: 1638: 1635: 1632: 1629: 1626: 1603: 1600: 1597: 1594: 1591: 1569: 1566: 1562: 1539: 1535: 1507: 1487: 1484: 1481: 1478: 1475: 1472: 1461: 1460: 1449: 1441: 1437: 1433: 1430: 1427: 1424: 1421: 1416: 1413: 1408: 1404: 1400: 1397: 1394: 1391: 1388: 1384: 1378: 1374: 1370: 1367: 1364: 1361: 1358: 1355: 1352: 1349: 1346: 1343: 1337: 1334: 1331: 1328: 1325: 1319: 1316: 1313: 1308: 1300: 1297: 1294: 1290: 1284: 1281: 1278: 1275: 1272: 1269: 1266: 1241: 1237: 1216: 1213: 1210: 1190: 1187: 1184: 1181: 1176: 1173: 1170: 1166: 1145: 1142: 1139: 1136: 1127:The fact that 1122: 1121: 1110: 1102: 1098: 1094: 1087: 1082: 1079: 1074: 1070: 1063: 1058: 1054: 1050: 1047: 1044: 1041: 1038: 1033: 1029: 1025: 1022: 1019: 1016: 1013: 1010: 1007: 1000: 994: 991: 984: 979: 976: 973: 967: 964: 961: 958: 955: 932: 929: 926: 921: 908: 907: 896: 893: 890: 887: 884: 878: 875: 872: 867: 859: 856: 853: 849: 843: 840: 837: 834: 831: 828: 825: 800: 796: 775: 764: 763: 752: 749: 746: 742: 739: 736: 733: 728: 725: 722: 718: 712: 707: 703: 699: 696: 693: 690: 685: 659: 656: 653: 650: 627: 624: 621: 618: 615: 612: 609: 606: 603: 600: 597: 594: 583: 582: 571: 565: 562: 559: 556: 549: 546: 543: 539: 535: 530: 526: 519: 513: 510: 503: 498: 492: 489: 486: 483: 480: 457: 454: 434: 414: 403: 402: 391: 385: 382: 379: 376: 373: 370: 363: 359: 355: 352: 349: 346: 340: 335: 308: 305: 299: 274: 252: 232: 229: 207: 193: 190: 69: 68: 31: 29: 22: 15: 13: 10: 9: 6: 4: 3: 2: 4257: 4246: 4243: 4242: 4240: 4228: 4226:0-08-023038-5 4222: 4218: 4214: 4209: 4205: 4203:0-471-54607-0 4199: 4195: 4191: 4186: 4182: 4180:0-486-60147-1 4176: 4172: 4167: 4166: 4159: 4158: 4153: 4146: 4141: 4139: 4137: 4135: 4131: 4128: 4123: 4120: 4117: 4116:Khinchin 1949 4112: 4110: 4106: 4102: 4096: 4093: 4086: 4082: 4079: 4077: 4074: 4072: 4069: 4067: 4064: 4063: 4059: 4039: 4034: 4028: 4020: 4011: 4006: 3995: 3991: 3984: 3970: 3963: 3949: 3938: 3934: 3927: 3911: 3906: 3900: 3892: 3883: 3876: 3872: 3864: 3860: 3848: 3838: 3824: 3813: 3798: 3791: 3775: 3771: 3759: 3751: 3735: 3730: 3724: 3716: 3707: 3702: 3691: 3683: 3669: 3658: 3650: 3636: 3625: 3610: 3599: 3595: 3588: 3572: 3567: 3561: 3553: 3544: 3539: 3528: 3520: 3504: 3499: 3493: 3485: 3476: 3471: 3460: 3456: 3449: 3435: 3428: 3414: 3403: 3386: 3381: 3375: 3367: 3358: 3351: 3347: 3339: 3335: 3323: 3313: 3299: 3288: 3280: 3266: 3259: 3243: 3239: 3231: 3227: 3215: 3205: 3191: 3180: 3165: 3155: 3141: 3131: 3117: 3107: 3093: 3083: 3080: 3076: 3075:heat capacity 3058: 3054: 3045: 3044:heat capacity 3027: 3023: 2997: 2993: 2987: 2983: 2969: 2955: 2935: 2932: 2929: 2926: 2923: 2911: 2909: 2893: 2889: 2883: 2879: 2853: 2849: 2843: 2839: 2812: 2808: 2796: 2792: 2786: 2782: 2775: 2768: 2764: 2758: 2754: 2747: 2743: 2739: 2736: 2723: 2719: 2713: 2709: 2698: 2694: 2690: 2685: 2681: 2678: 2674: 2668: 2661: 2658: 2655: 2652: 2649: 2646: 2643: 2639: 2635: 2632: 2625: 2624: 2623: 2606: 2602: 2598: 2595: 2590: 2586: 2582: 2577: 2573: 2569: 2561: 2557: 2553: 2550: 2547: 2542: 2538: 2534: 2529: 2525: 2518: 2506: 2504: 2485: 2481: 2470:The quantity 2454: 2450: 2438: 2434: 2427: 2421: 2417: 2411: 2407: 2403: 2400: 2389: 2385: 2378: 2375: 2371: 2366: 2360: 2354: 2347: 2346: 2345: 2342: 2338: 2334: 2315: 2311: 2304: 2298: 2294: 2290: 2287: 2284: 2278: 2272: 2265: 2264: 2263: 2248: 2228: 2208: 2205: 2199: 2193: 2173: 2161: 2159: 2153: 2151: 2131: 2128: 2125: 2121: 2111: 2098: 2095: 2092: 2084: 2081: 2072: 2069: 2063: 2060: 2057: 2051: 2044: 2043: 2042: 2025: 2022: 2019: 2010: 2007: 2004: 1975: 1972: 1968: 1962: 1958: 1952: 1949: 1946: 1939: 1934: 1931: 1928: 1920: 1911: 1902: 1886: 1885: 1884: 1870: 1866: 1860: 1852: 1846: 1838: 1830: 1798: 1791: 1787: 1784: 1775: 1766: 1743: 1735: 1727: 1718: 1715: 1701: 1692: 1674: 1662: 1653: 1649: 1642: 1633: 1617: 1616: 1615: 1598: 1592: 1589: 1567: 1564: 1560: 1537: 1533: 1523: 1521: 1482: 1479: 1476: 1470: 1447: 1439: 1431: 1422: 1419: 1406: 1398: 1386: 1382: 1376: 1365: 1359: 1356: 1350: 1344: 1341: 1335: 1329: 1314: 1298: 1295: 1292: 1288: 1282: 1276: 1273: 1270: 1264: 1257: 1256: 1255: 1239: 1235: 1211: 1185: 1174: 1171: 1168: 1164: 1140: 1125: 1108: 1100: 1096: 1080: 1077: 1072: 1061: 1056: 1048: 1039: 1031: 1020: 1014: 1011: 998: 992: 977: 974: 965: 962: 956: 946: 945: 944: 927: 894: 888: 873: 857: 854: 851: 847: 841: 835: 832: 829: 823: 816: 815: 814: 798: 794: 773: 750: 747: 744: 737: 726: 723: 720: 716: 705: 701: 697: 691: 674: 673: 672: 654: 639: 622: 619: 616: 607: 601: 592: 569: 560: 547: 544: 541: 537: 533: 528: 524: 517: 511: 490: 484: 471: 470: 469: 455: 452: 412: 389: 380: 377: 374: 361: 353: 350: 347: 338: 324: 323: 322: 306: 303: 297: 272: 250: 230: 227: 191: 189: 187: 183: 179: 175: 171: 167: 163: 159: 154: 152: 148: 144: 141:, the volume 140: 135: 133: 129: 125: 123: 119: 115: 110: 108: 104: 99: 97: 96:absolute zero 92: 88: 79: 75: 65: 62: 54: 42: 41: 35: 30: 21: 20: 4212: 4189: 4164: 4127:Lavenda 1991 4122: 4095: 2915: 2827: 2510: 2469: 2330: 2165: 2157: 2148: 1996: 1758: 1524: 1462: 1126: 1123: 909: 765: 640: 584: 404: 195: 155: 146: 142: 138: 136: 126: 111: 100: 90: 84: 57: 48: 37: 2337:equilibrium 168:(including 166:dissipation 103:temperature 4154:References 4026:∂ 4018:∂ 3992:− 3935:− 3898:∂ 3890:∂ 3822:Δ 3722:∂ 3714:∂ 3634:Δ 3596:− 3559:∂ 3551:∂ 3491:∂ 3483:∂ 3457:− 3412:Δ 3373:∂ 3365:∂ 3189:Δ 3163:Δ 3139:Δ 3115:Δ 3091:Δ 3003:⟩ 2980:⟨ 2972:Averages 2859:⟩ 2836:⟨ 2802:⟩ 2779:⟨ 2748:− 2740:⁡ 2729:⟩ 2706:⟨ 2682:π 2659:… 2640:∏ 2596:… 2551:… 2491:⟩ 2478:⟨ 2444:⟩ 2431:⟨ 2412:− 2404:⁡ 2395:⟩ 2382:⟨ 2379:π 2291:⁡ 2285:∝ 2129:β 2126:− 2106:Γ 2096:− 2082:β 2073:β 2064:β 2014:Γ 1973:− 1950:π 1932:− 1925:⟩ 1918:⟨ 1906:⟩ 1900:⟨ 1894:Ω 1857:⟩ 1850:⟨ 1844:⟩ 1828:Δ 1822:⟨ 1802:⟩ 1796:⟨ 1779:⟩ 1773:⟨ 1767:β 1725:Δ 1719:π 1705:⟩ 1699:⟨ 1693:β 1678:⟩ 1672:⟨ 1666:⟩ 1660:⟨ 1654:β 1637:⟩ 1631:⟨ 1625:Ω 1602:⟩ 1596:⟨ 1565:− 1561:β 1506:Ω 1483:β 1429:Δ 1423:π 1412:⟩ 1396:Δ 1390:⟨ 1369:⟩ 1363:⟨ 1360:− 1351:− 1345:⁡ 1336:≈ 1324:Ω 1315:β 1296:β 1293:− 1277:β 1240:⋆ 1215:⟩ 1209:⟨ 1180:Ω 1172:β 1169:− 1135:Ω 1097:β 1093:∂ 1081:⁡ 1069:∂ 1046:Δ 1037:⟩ 1024:⟩ 1018:⟨ 1015:− 1006:⟨ 993:β 990:∂ 978:⁡ 972:∂ 966:− 960:⟩ 954:⟨ 928:β 883:Ω 874:β 855:β 852:− 836:β 799:⋆ 774:β 732:Ω 724:β 721:− 711:∞ 702:∫ 692:β 649:Ω 611:Γ 596:Γ 555:Γ 545:− 534:⋅ 509:∂ 497:∂ 479:Ω 433:Γ 369:Γ 351:⋅ 174:viscosity 162:diffusion 51:July 2020 4239:Category 4060:See also 2166:Suppose 3073:is the 3042:is the 170:damping 149:in the 132:entropy 118:phonons 34:sources 4223:  4200:  4177:  2828:where 1003:  405:where 122:rotons 81:shown. 4087:Notes 1614:give 158:noise 4221:ISBN 4198:ISBN 4175:ISBN 2948:and 2221:for 184:and 172:and 164:and 36:but 4099:In 2737:exp 2401:exp 2288:exp 1342:exp 85:In 4241:: 4219:. 4196:. 4192:. 4173:. 4169:. 4133:^ 4108:^ 2908:. 1078:ln 975:ln 638:. 188:. 109:. 98:. 89:, 4229:. 4206:. 4183:. 4040:S 4035:) 4029:V 4021:P 4012:( 4007:T 4001:B 3996:k 3971:0 3950:T 3944:B 3939:k 3912:V 3907:) 3901:T 3893:P 3884:( 3877:2 3873:T 3865:V 3861:C 3854:B 3849:k 3825:P 3799:0 3776:P 3772:C 3765:B 3760:k 3736:P 3731:) 3725:T 3717:V 3708:( 3703:T 3697:B 3692:k 3670:T 3664:B 3659:k 3637:S 3611:T 3605:B 3600:k 3573:P 3568:) 3562:T 3554:V 3545:( 3540:T 3534:B 3529:k 3505:T 3500:) 3494:P 3486:V 3477:( 3472:T 3466:B 3461:k 3436:0 3415:V 3387:V 3382:) 3376:T 3368:P 3359:( 3352:2 3348:T 3340:V 3336:C 3329:B 3324:k 3300:T 3294:B 3289:k 3267:0 3244:2 3240:T 3232:V 3228:C 3221:B 3216:k 3192:T 3166:P 3142:S 3118:V 3094:T 3059:V 3055:C 3028:P 3024:C 2998:j 2994:x 2988:i 2984:x 2956:S 2936:P 2933:, 2930:V 2927:, 2924:T 2894:j 2890:x 2884:i 2880:x 2854:j 2850:x 2844:i 2840:x 2813:, 2809:) 2797:j 2793:x 2787:i 2783:x 2776:2 2769:j 2765:x 2759:i 2755:x 2744:( 2724:j 2720:x 2714:i 2710:x 2699:2 2695:/ 2691:n 2686:) 2679:2 2675:( 2669:1 2662:n 2656:1 2653:= 2650:j 2647:, 2644:i 2636:= 2633:w 2621:: 2607:n 2603:x 2599:d 2591:2 2587:x 2583:d 2578:1 2574:x 2570:d 2567:) 2562:n 2558:x 2554:, 2548:, 2543:2 2539:x 2535:, 2530:1 2526:x 2522:( 2519:w 2486:2 2482:x 2455:. 2451:) 2439:2 2435:x 2428:2 2422:2 2418:x 2408:( 2390:2 2386:x 2376:2 2372:1 2367:= 2364:) 2361:x 2358:( 2355:w 2343:: 2316:. 2312:) 2308:) 2305:x 2302:( 2299:S 2295:( 2282:) 2279:x 2276:( 2273:w 2261:: 2249:S 2229:x 2209:x 2206:d 2203:) 2200:x 2197:( 2194:w 2174:x 2132:E 2122:e 2115:) 2112:m 2109:( 2099:1 2093:m 2089:) 2085:E 2079:( 2070:= 2067:) 2061:; 2058:E 2055:( 2052:f 2029:) 2026:1 2023:+ 2020:m 2017:( 2011:= 2008:! 2005:m 1993:. 1976:m 1969:e 1963:m 1959:m 1953:m 1947:2 1940:m 1935:1 1929:m 1921:E 1912:= 1909:) 1903:E 1897:( 1871:m 1867:/ 1861:2 1853:E 1847:= 1839:2 1835:) 1831:E 1825:( 1799:E 1792:/ 1788:m 1785:= 1782:) 1776:E 1770:( 1744:. 1736:2 1732:) 1728:E 1722:( 1716:2 1711:) 1708:) 1702:E 1696:( 1690:( 1685:Z 1675:E 1669:) 1663:E 1657:( 1650:e 1643:= 1640:) 1634:E 1628:( 1599:E 1593:= 1590:E 1568:m 1538:m 1534:E 1486:) 1480:; 1477:E 1474:( 1471:f 1448:. 1440:2 1436:) 1432:E 1426:( 1420:2 1415:} 1407:2 1403:) 1399:E 1393:( 1387:2 1383:/ 1377:2 1373:) 1366:E 1357:E 1354:( 1348:{ 1333:) 1330:E 1327:( 1318:) 1312:( 1307:Z 1299:E 1289:e 1283:= 1280:) 1274:; 1271:E 1268:( 1265:f 1236:E 1212:E 1189:) 1186:E 1183:( 1175:E 1165:e 1144:) 1141:E 1138:( 1109:, 1101:2 1086:Z 1073:2 1062:= 1057:2 1053:) 1049:E 1043:( 1040:= 1032:2 1028:) 1021:E 1012:E 1009:( 999:, 983:Z 963:= 957:E 931:) 925:( 920:Z 895:, 892:) 889:E 886:( 877:) 871:( 866:Z 858:E 848:e 842:= 839:) 833:; 830:E 827:( 824:f 795:E 751:, 748:E 745:d 741:) 738:E 735:( 727:E 717:e 706:0 698:= 695:) 689:( 684:Z 658:) 655:E 652:( 626:) 623:1 620:+ 617:m 614:( 608:= 605:) 602:m 599:( 593:m 570:, 564:) 561:m 558:( 548:1 542:m 538:E 529:m 525:C 518:= 512:E 502:V 491:= 488:) 485:E 482:( 456:m 453:2 413:C 390:, 384:) 381:1 378:+ 375:m 372:( 362:m 358:) 354:E 348:C 345:( 339:= 334:V 307:m 304:2 298:E 273:E 251:V 231:m 228:2 206:V 147:E 143:V 139:N 64:) 58:( 53:) 49:( 43:.

Index

sources
page references
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Atomic diffusion
statistical mechanics
absolute zero
temperature
Boltzmann distribution
degrees of freedom
phonons
rotons
Thermodynamic variables
entropy
microcanonical ensemble
noise
diffusion
dissipation
damping
viscosity
fluctuation-dissipation theorem
phase transitions
chemical kinetics
central limit theorem
Taylor expanded
equilibrium
Gaussian distribution
heat capacity
heat capacity
Quantum fluctuations

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