Naphthalene

• Formula: C₁₀H₈
• Molecular weight: 128.1705
• IUPAC Standard InChI: InChI=1S/C10H8/c1-2-6-10-8-4-3-7-9(10)5-1/h1-8H Copy

  
• IUPAC Standard InChIKey: UFWIBTONFRDIAS-UHFFFAOYSA-N Copy
• CAS Registry Number: 91-20-3
• Chemical structure:
  This structure is also available as a 2d Mol file or as a computed 3d SD file
  The 3d structure may be viewed using Java or Javascript.
• Isotopologues:
  • Naphthalene-D8
• Other names: Albocarbon; Dezodorator; Moth flakes; Naphthalin; Naphthaline; Naphthene; Tar camphor; White tar; Camphor tar; Moth balls; Naftalen; NCI-C52904; Mighty 150; Mighty RD1; Rcra waste number U165; UN 1334; UN 2304; NSC 37565
• Permanent link for this species. Use this link for bookmarking this species for future reference.
• Information on this page:
  • Phase change data
  • References
  • Notes
• Other data available:
  • Gas phase thermochemistry data
  • Condensed phase thermochemistry data
  • Reaction thermochemistry data
  • Henry's Law data
  • Gas phase ion energetics data
  • Ion clustering data
  • IR Spectrum
  • Mass spectrum (electron ionization)
  • UV/Visible spectrum
  • Gas Chromatography
• Data at other public NIST sites:
  • Gas Phase Kinetics Database
  • X-ray Photoelectron Spectroscopy Database, version 5.0
  • NIST Polycyclic Aromatic Hydrocarbon Structure Index
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Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos
DH - Eugene S. Domalski and Elizabeth D. Hearing
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Enthalpy of vaporization

Entropy of vaporization

Antoine Equation Parameters

log₁₀(P) = A − (B / (T + C))
    P = vapor pressure (bar)
    T = temperature (K)

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Enthalpy of sublimation

Entropy of sublimation

Enthalpy of fusion

Entropy of fusion

Enthalpy of phase transition

Entropy of phase transition

References

Go To: Top, Phase change data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Tsonopoulos and Ambrose, 1995
Tsonopoulos, C.; Ambrose, D., Vapor-Liquid Critical Properties of Elements and Compounds. 3. Aromatic Hydrocarbons, J. Chem. Eng. Data, 1995, 40, 547-558. [all data]

Cheng, 1963
Cheng, D.C.H., Critical temperatures and volumes of some binary systems, Chem. Eng. Sci., 1963, 18, 715. [all data]

Chirico, Knipmeyer, et al., 1993
Chirico, R.D.; Knipmeyer, S.E.; Nguyen, A.; Steele, W.V., The thermodynamic properties to the temperature 700 K of naphthalene and of 2,7-dimethylnaphthalene, J. Chem. Thermodyn., 1993, 25, 1461-94. [all data]

Schroeer, 1941
Schroeer, E., Critical State VI. Vapor-pressure Curve of Naphthalene Up To the Critical Point, Z. Phys. Chem., Abt. B, 1941, 49, 271-8. [all data]

Zhuravlev, 1937
Zhuravlev, D.I., Crit. Temp. and Orthobaric Density of Diphenyl Ether and Napphthalene naphthalene, Zh. Fiz. Khim., 1937, 9, 875. [all data]

Zhao, Unhannanant, et al., 2008
Zhao, Hui; Unhannanant, Patamaporn; Hanshaw, William; Chickos, James S., Enthalpies of Vaporization and Vapor Pressures of Some Deuterated Hydrocarbons. Liquid-Vapor Pressure Isotope Effects, J. Chem. Eng. Data, 2008, 53, 7, 1545-1556, https://doi.org/10.1021/je800091s . [all data]

Haftka, Parsons, et al., 2006
Haftka, Joris J.H.; Parsons, John R.; Govers, Harrie A.J., Supercooled liquid vapour pressures and related thermodynamic properties of polycyclic aromatic hydrocarbons determined by gas chromatography, Journal of Chromatography A, 2006, 1135, 1, 91-100, https://doi.org/10.1016/j.chroma.2006.09.050 . [all data]

Chickos, Hesse, et al., 1998
Chickos, James; Hesse, Donald; Hosseini, Sarah; Nichols, Gary; Webb, Paul, Sublimation enthalpies at 298.15K using correlation gas chromatography and differential scanning calorimetry measurements, Thermochimica Acta, 1998, 313, 2, 101-110, https://doi.org/10.1016/S0040-6031(97)00432-2 . [all data]

Chickos, Hosseini, et al., 1995
Chickos, James S.; Hosseini, Sarah; Hesse, Donald G., Determination of vaporization enthalpies of simple organic molecules by correlations of changes in gas chromatographic net retention times, Thermochimica Acta, 1995, 249, 41-62, https://doi.org/10.1016/0040-6031(95)90670-3 . [all data]

Torres-Gomez, Barreiro-Rodriguez, et al., 1988
Torres-Gomez, L.A.; Barreiro-Rodriguez, G.; Galarza-Mondragon, A., A new method for the measurement of enthalpies of sublimation using differential scanning calorimetry, Thermochim. Acta, 1988, 124, 229-233. [all data]

Lei, Chankalal, et al., 2002
Lei, Ying Duan; Chankalal, Raymond; Chan, Anita; Wania, Frank, Supercooled Liquid Vapor Pressures of the Polycyclic Aromatic Hydrocarbons, J. Chem. Eng. Data, 2002, 47, 4, 801-806, https://doi.org/10.1021/je0155148 . [all data]

Boller and Wiedemann, 1998
Boller, A.; Wiedemann, H.G., Journal of Thermal Analysis and Calorimetry, 1998, 53, 2, 431-439, https://doi.org/10.1023/A:1010133106907 . [all data]

Back, Grzyll, et al., 1996
Back, Dwight D.; Grzyll, Lawrence R.; Corrigan, Mary, DSC enthalpy of vaporization measurements of high temperature two-phase working fluids, Thermochimica Acta, 1996, 272, 53-63, https://doi.org/10.1016/0040-6031(95)02615-0 . [all data]

Chirico, Knipmeyer, et al., 1993, 2
Chirico, R.D.; Knipmeyer, S.E.; Nguyen, A.; Steele, W.V., The thermodynamic properties to the temperature 700 K of naphthalene and of 2,7-dimethylnaphthalene, J. Chem. Thermodyn., 1993, 25, 1461-1494. [all data]

Lee and Holder, 1993
Lee, Chang Ha; Holder, Gerald D., Vapor-liquid equilibria in the systems toluene/naphthalene and cyclohexane/naphthalene, J. Chem. Eng. Data, 1993, 38, 2, 320-323, https://doi.org/10.1021/je00010a034 . [all data]

Ambrose, Ewing, et al., 1990
Ambrose, D.; Ewing, M.B.; Ghiassee, N.B.; Sanchez Ochoa, J.C., The ebulliometric method of vapour-pressure measurement: vapour pressures of benzene, hexafluorobenzene, and naphthalene, The Journal of Chemical Thermodynamics, 1990, 22, 6, 589-605, https://doi.org/10.1016/0021-9614(90)90151-F . [all data]

Stephenson and Malanowski, 1987
Stephenson, Richard M.; Malanowski, Stanislaw, Handbook of the Thermodynamics of Organic Compounds, 1987, https://doi.org/10.1007/978-94-009-3173-2 . [all data]

de Kruif, Kuipers, et al., 1981
de Kruif, C.G.; Kuipers, T.; van Miltenburg, J.C.; Schaake, R.C.F.; Stevens, G., The vapour pressure of solid and liquid naphthalene, The Journal of Chemical Thermodynamics, 1981, 13, 11, 1081-1086, https://doi.org/10.1016/0021-9614(81)90006-9 . [all data]

Wilson, Johnston, et al., 1981
Wilson, Grant M.; Johnston, Robert H.; Hwang, Shuen-Cheng.; Tsonopoulos, Constantine., Volatility of coal liquids at high temperatures and pressures, Ind. Eng. Chem. Proc. Des. Dev., 1981, 20, 1, 94-104, https://doi.org/10.1021/i200012a015 . [all data]

Fowler, Trump, et al., 1968
Fowler, Lewis.; Trump, Walter N.; Vogler, Carl E., Vapor pressure of naphthalene. Measurements between 40.deg. and 180.deg., J. Chem. Eng. Data, 1968, 13, 2, 209-210, https://doi.org/10.1021/je60037a020 . [all data]

Camin and Rossini, 1955
Camin, David L.; Rossini, Frederick D., Physical Properties of Fourteen API Research Hydrocarbons, C ₉ to C ₁₅, J. Phys. Chem., 1955, 59, 11, 1173-1179, https://doi.org/10.1021/j150533a014 . [all data]

Barrow and McClellan, 1951
Barrow, Gordon M.; McClellan, A.L., The Thermodynamic Properties of Naphthalene, J. Am. Chem. Soc., 1951, 73, 2, 573-575, https://doi.org/10.1021/ja01146a020 . [all data]

Cramer, 1943
Cramer, K.S.N., Chem. Zentr. II, 1943, 2234. [all data]

Mortimer and Murphy, 1923
Mortimer, F. Spencer.; Murphy, Ray v., The Vapor Pressures of Some Substances Found in Coal Tar., Ind. Eng. Chem., 1923, 15, 11, 1140-1142, https://doi.org/10.1021/ie50167a012 . [all data]

NELSON and SENSEMAN, 1922
NELSON, O.A.; SENSEMAN, C.E., Vapor Pressure Determinations on Naphthalene, Anthracene, Phecanthrene, and Anthraquinone between Their Melting and Boiling Points, J. Ind. Eng. Chem., 1922, 14, 1, 58-62, https://doi.org/10.1021/ie50145a028 . [all data]

Grayson and Fosbraey, 2006
Grayson, B. Terence; Fosbraey, Lynda A., Determination of the vapour pressure of pesticides, Pestic. Sci., 2006, 13, 3, 269-278, https://doi.org/10.1002/ps.2780130308 . [all data]

McEachern and Sandoval, 2001
McEachern, D.M.; Sandoval, O., A molecular flow evaporation apparatus for measuring vapour pressures and heats of sublimation of organic compounds, J. Phys. E: Sci. Instrum., 2001, 6, 2, 155-161, https://doi.org/10.1088/0022-3735/6/2/026 . [all data]

Nass, Lenoir, et al., 1995
Nass, Karen; Lenoir, Dieter; Kettrup, Antonius, Calculation of the Thermodynamic Properties of Polycyclic Aromatic Hydrocarbons by an Incremental Procedure, Angew. Chem. Int. Ed. Engl., 1995, 34, 16, 1735-1736, https://doi.org/10.1002/anie.199517351 . [all data]

Wania, Shiu, et al., 1994
Wania, Frank; Shiu, Wan-Ying; Mackay, Donald, Measurement of the Vapor Pressure of Several Low-Volatility Organochlorine Chemicals at Low Temperatures with a Gas Saturation Method, J. Chem. Eng. Data, 1994, 39, 3, 572-577, https://doi.org/10.1021/je00015a039 . [all data]

Khudyakov, 1988
Khudyakov, V.L., Russ. J. Phys. Chem., 1988, 62, 1743. [all data]

SATO, INOMATA, et al., 1986
SATO, NOBUYUKI; INOMATA, HIROSHI; ARAI, KUNIO; SAITO, SHOZABURO, Measurement of vapor pressures for coal-related aromatic compounds by gas saturation method., J. Chem. Eng. Japan / JCEJ, 1986, 19, 2, 145-147, https://doi.org/10.1252/jcej.19.145 . [all data]

Glukhova, Arkhangelova, et al., 1985
Glukhova, O.T.; Arkhangelova, N.M.; Teplitsky, A.B.; Sukhodub, L.F.; Yanson, I.K.; Kaminski, Miron, The low-temperature quartz resonator method for determination of the enthalpy of sublimation, Thermochimica Acta, 1985, 95, 1, 133-138, https://doi.org/10.1016/0040-6031(85)80041-1 . [all data]

Matsubara and Kuwamoto, 1985
Matsubara, Norio; Kuwamoto, Tooru, Vapor pressure measurements in carrier gas containing ligand vapor using the transpiration technique, Thermochimica Acta, 1985, 83, 2, 193-202, https://doi.org/10.1016/0040-6031(85)87003-9 . [all data]

Sonnefeld, Zoller, et al., 1983
Sonnefeld, W.J.; Zoller, W.H.; May, W.E., Dynamic coupled-column liquid-chromatographic determination of ambient-temperature vapor pressures of polynuclear aromatic hydrocarbons, Anal. Chem., 1983, 55, 2, 275-280, https://doi.org/10.1021/ac00253a022 . [all data]

Colomina, Jimenez, et al., 1982
Colomina, M.; Jimenez, P.; Turrion, C., Vapour pressures and enthalpies of sublimation of naphthalene and benzoic acid, J. Chem. Thermodyn., 1982, 14, 779-784. [all data]

Kruif, 1980
Kruif, C.G., Enthalpies of sublimation and vapour pressures of 11 polycyclic hydrocarbons, J. Chem. Thermodyn., 1980, 12, 243-248. [all data]

Murray, Cavell, et al., 1980
Murray, J.P.; Cavell, K.J.; Hill, J.O., A DSC study of benzoic acid: a suggested calibrant compound, Thermochimica Acta, 1980, 36, 1, 97-101, https://doi.org/10.1016/0040-6031(80)80114-6 . [all data]

Macknick and Prausnitz, 1979
Macknick, A. Brian; Prausnitz, John M., Vapor pressures of high-molecular-weight hydrocarbons, J. Chem. Eng. Data, 1979, 24, 3, 175-178, https://doi.org/10.1021/je60082a012 . [all data]

De Kruif and Van Ginkel, 1977
De Kruif, C.G.; Van Ginkel, C.H.D., Torsion-weighing effusion vapour-pressure measurements on organic compounds, The Journal of Chemical Thermodynamics, 1977, 9, 8, 725-730, https://doi.org/10.1016/0021-9614(77)90015-5 . [all data]

Ambrose, Lawrenson, et al., 1975
Ambrose, D.; Lawrenson, I.J.; Sprake, C.H.S., The vapour pressure of naphthalene, The Journal of Chemical Thermodynamics, 1975, 7, 12, 1173-1176, https://doi.org/10.1016/0021-9614(75)90038-5 . [all data]

Chickos, 1975
Chickos, James Speros, A simple equilibrium method for determining heats of sublimation, J. Chem. Educ., 1975, 52, 2, 134-39, https://doi.org/10.1021/ed052p134 . [all data]

McEachern, Sandoval, et al., 1975
McEachern, D.M.; Sandoval, O.; Iniguez, J.C., Vapor pressures, derived enthalpies of sublimation, enthalpies of fusion, and resonance energies of acridine and phenazine, J. Chem. Thermodyn., 1975, 7, 299-306. [all data]

Radchenko and Kitaigorodskii, 1974
Radchenko, L.G.; Kitaigorodskii, A.I., The vapour pressures and heats of sublimation of naphthalene, biphenyl, octafluoronaphthalene, decafluorobiphenyl, acenaphthene and α-nitronaphthalene, Russ. J. Phys. Chem. (Engl. Transl.), 1974, 48, 1595. [all data]

Radchenko, 1971
Radchenko, L.G., Zh. Fiz. Khim., 1971, 45, 5, 1310. [all data]

Karyakin, Rabinovich, et al., 1968
Karyakin, N.V.; Rabinovich, I.B.; Pakhomov, L.G., Heats of sublimation of naphthalene and its monosubstituted β-derivatives, Russ. J. Phys. Chem. (Engl. Transl.), 1968, 42, 954. [all data]

Miller, 1963
Miller, George A., Vapor Pressure of Naphthalene. Thermodynamic Consistency with Proposed Frequency Assignments., J. Chem. Eng. Data, 1963, 8, 1, 69-72, https://doi.org/10.1021/je60016a019 . [all data]

Cox and Pilcher, 1970
Cox, J.D.; Pilcher, G., Thermochemistry of Organic and Organometallic Compounds, Academic Press Inc., London, 1970, 643. [all data]

Aihara, 1959
Aihara, A., Estimation of the energy of hydrogen bonds formed in crystals. I. Sublimation pressures of some organic molecular crystals and the additivity of lattice energy, Bull. Chem. Soc. Jpn., 1959, 32, 1242. [all data]

Aihara, 1959, 2
Aihara, Ariyuki, Estimation of the Energy of Hydrogen Bonds Formed in Crystals. I. Sublimation Pressures of Some Organic Molecular Crystals and the Additivity of Lattice Energy, Bull. Chem. Soc. Jpn., 1959, 32, 11, 1242-1248, https://doi.org/10.1246/bcsj.32.1242 . [all data]

Hoyer and Peperle, 1958
Hoyer, H.; Peperle, W., Z. Elektrochem., 1958, 62, 61. [all data]

Sklyarenko, Markin, et al., 1958
Sklyarenko, S.I.; Markin, B.I.; Belyaeva, L.B., Zh. Fiz. Khim., 1958, 32, 1916. [all data]

Sherwood and Bryant, 1957
Sherwood, T.K.; Bryant, J.H., Jr., Can. J. Chem. Eng., 1957, 35, 51. [all data]

Bradley and Cleasby, 1953
Bradley, R.S.; Cleasby, T.G., 346. The vapour pressure and lattice energy of hydrogen-bonded crystals. Part I. Oxamide, oxamic acid, and rubeanic acid, J. Chem. Soc., 1953, 1681, https://doi.org/10.1039/jr9530001681 . [all data]

Jones, 1960
Jones, A.H., Sublimation Pressure Data for Organic Compounds., J. Chem. Eng. Data, 1960, 5, 2, 196-200, https://doi.org/10.1021/je60006a019 . [all data]

Sears and Hopke, 1954
Sears, G.W.; Hopke, E.R., The Vapor Pressure of Naphthalene, J. Am. Chem. Soc., 1954, 76, 7, 2026-2026, https://doi.org/10.1021/ja01636a099 . [all data]

Bradley and Cleasby, 1953, 2
Bradley, R.S.; Cleasby, T.G., The vapour pressure and lattice energy of some aromatic ring compounds, J. Am. Chem. Soc., 1953, 1690-16. [all data]

Zibberman-Granovskaya, 1940
Zibberman-Granovskaya, A.A., Russ. J. Phys. Chem., 1940, 14, 759. [all data]

Andrews, 1925
Andrews, Mary R., Vapor Pressure of Naphthalene at Low Temperatures, J. Phys. Chem., 1925, 30, 11, 1497-1500, https://doi.org/10.1021/j150269a005 . [all data]

Swan and Mack, 1925
Swan, Thomas H.; Mack, Edward, VAPOR PRESSURES OF ORGANIC CRYSTALS BY AN EFFUSION METHOD, J. Am. Chem. Soc., 1925, 47, 8, 2112-2116, https://doi.org/10.1021/ja01685a005 . [all data]

Mastrangelo, 1957
Mastrangelo, S.V.R., Adiabatic calorimeter for determination of cryoscopic data, Anal. Chem., 1957, 29(5), 841-845. [all data]

McCullough, Finke, et al., 1957
McCullough, J.P.; Finke, H.L.; Messerly, J.F.; Kincheloe, T.C.; Waddington, G., The low temperature thermodynamic properties of naphthalene, 1-methylnaphthalene, 2-methylnaphthalene, 1,2,3,4-tetrahydronaphthalene, trans-decahydronaphthalene and cis-decahydronaphthalene, J. Phys. Chem., 1957, 61, 1105-1116. [all data]

Spaght, Thomas, et al., 1932
Spaght, M.E.; Thomas, S.B.; Parks, G.S., Some heat capacity data on organic compounds obtained with a radiation calorimeter, J. Phys. Chem., 1932, 36, 882-888. [all data]

Sharma, Gupta, et al., 2008
Sharma, B.L.; Gupta, S.; Tandon, S.; Kant, R., Physico-mechanical properties of naphthalene--acenaphthene eutectic system by different modes of solidification, Materials Chemistry and Physics, 2008, 111, 2-3, 423-430, https://doi.org/10.1016/j.matchemphys.2008.04.049 . [all data]

Hafsaoui and Mahmoud, 2007
Hafsaoui, S.L.; Mahmoud, R., Solid-liquid equilibria of binary systems containing n-tetracosane with naphthalene or dibenzofuran, J Therm Anal Calorim, 2007, 88, 2, 565-570, https://doi.org/10.1007/s10973-006-8084-2 . [all data]

Khimeche and Dahmani, 2006
Khimeche, Kamel; Dahmani, Abdallah, Solid-Liquid Equilibria of Naphthalene + Alkanediamine Mixtures, J. Chem. Eng. Data, 2006, 51, 2, 382-385, https://doi.org/10.1021/je0502851 . [all data]

Khimeche and Dahmani, 2006, 2
Khimeche, K.; Dahmani, A., Determination by DSC of solid--liquid diagrams for polyaromatic -- 4,4'diaminodiphenylmethane binary systems, J Therm Anal Calorim, 2006, 84, 1, 47-52, https://doi.org/10.1007/s10973-005-7167-9 . [all data]

Chirico, Knipmeyer, et al., 2002
Chirico, R.D.; Knipmeyer, S.E.; Steele, W.V., Heat capacities, enthalpy increments, and derived thermodynamic functions for naphthalene between the temperatures 5K and 440K, The Journal of Chemical Thermodynamics, 2002, 34, 11, 1873-1884, https://doi.org/10.1016/S0021-9614(02)00262-8 . [all data]

Acree, 1991
Acree, William E., Thermodynamic properties of organic compounds: enthalpy of fusion and melting point temperature compilation, Thermochimica Acta, 1991, 189, 1, 37-56, https://doi.org/10.1016/0040-6031(91)87098-H . [all data]

Syunyaev, Tumanyan, et al., 1984
Syunyaev, Z.I.; Tumanyan, B.P.; Kolesnikov, S.I.; Zhokhova, N.I., Some anomalies in melting points of binary mixtures of solid hydrocarbons, Zhur. Prikl. Khim. (Leningrad), 1984, 57, 666-669. [all data]

Rastogi and Bassi, 1964
Rastogi, R.P.; Bassi, P.S., Mechanism of eutectic crystallization, J. Phys. Chem., 1964, 68, 2398-2406. [all data]

Ueberreiter and Orthmann, 1950
Ueberreiter, K.; Orthmann, H.-J., Specifische Wärme, spezifisches Volumen, Temperatur- und Wärme-leittähigkeit einiger disubstituierter Benzole und polycyclischer Systeme, Z. Natursforsch. 5a, 1950, 101-108. [all data]

Eibert, 1944
Eibert, J., Thesis Washington University (St. Louis), 1944. [all data]

Schmidt, 1941
Schmidt, W.R., Thesis Washington University (St. Louis), 1941. [all data]

Andrews, Lynn, et al., 1926
Andrews, D.H.; Lynn, G.; Johnston, J., The heat capacities and heat of crystallization of some isomeric aromatic compounds, J. Am. Chem. Soc., 1926, 48, 1274-1287. [all data]

David, 1964
David, D.J., Determination of specific heat and heat of fusion by differential thermal analysis. Study of theory and operating parameters, Anal. Chem., 1964, 36, 2162-2166. [all data]

Andon and Connett, 1980
Andon, R.J.L.; Connett, J.E., Calibrants for thermal analysis. Measurement of their enthalpies of fusion by adiabatic calorimetry, Thermochim. Acta, 1980, 42, 241-247. [all data]

Radomska and Radomski, 1980
Radomska, M.; Radomski, R., Calorimetric studies of binary systems of 1,3,5-trinitrobenzene with naphthalene, anthracene, and carbazole. I. Phase transitions and heat capacities of the pure components and charge-transfer complexes, Thermochim. Acta, 1980, 40, 405-414. [all data]

Notes

Go To: Top, Phase change data, References

• Symbols used in this document:
  

  Pc	Critical pressure
  Tboil	Boiling point
  Tc	Critical temperature
  Tfus	Fusion (melting) point
  Ttriple	Triple point temperature
  Vc	Critical volume
  ΔHtrs	Enthalpy of phase transition
  ΔStrs	Entropy of phase transition
  ΔfusH	Enthalpy of fusion
  ΔfusS	Entropy of fusion
  ΔsubH	Enthalpy of sublimation
  ΔsubH°	Enthalpy of sublimation at standard conditions
  ΔsubS	Entropy of sublimation
  ΔvapH	Enthalpy of vaporization
  ΔvapH°	Enthalpy of vaporization at standard conditions
  ΔvapS	Entropy of vaporization
  ρc	Critical density

• Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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