Octane

Formula: C₈H₁₈
Molecular weight: 114.2285
IUPAC Standard InChI: InChI=1S/C8H18/c1-3-5-7-8-6-4-2/h3-8H2,1-2H3
IUPAC Standard InChIKey: TVMXDCGIABBOFY-UHFFFAOYSA-N
CAS Registry Number: 111-65-9
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:
Other names: n-Octane; n-C8H18; Oktan; Oktanen; Ottani; UN 1262
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Gas phase thermochemistry data

Go To: Top, Condensed phase thermochemistry data, Phase change data, References, Notes

Data compiled as indicated in comments:
DRB - Donald R. Burgess, Jr.
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
GT - Glushko Thermocenter, Russian Academy of Sciences, Moscow

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-49.88	kcal/mol	N/A	Good, 1972	Value computed using Δ_fH_liquid° value of -250.3±1.8 kj/mol from Good, 1972 and Δ_vapH° value of 41.6 kj/mol from Prosen and Rossini, 1945.; DRB
Δ_fH°_gas	-49.82 ± 0.16	kcal/mol	Ccb	Prosen and Rossini, 1945	see Prosen and Rossini, 1944; ALS
Quantity	Value	Units	Method	Reference	Comment
S°_gas	111.63 ± 0.22	cal/mol*K	N/A	Scott D.W., 1974	This reference does not contain the original experimental data. Experimental entropy value is based on the results [ Messerly J.F., 1967] for S(liquid).; GT

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
55.63 ± 0.11	385.65	Hossenlopp I.A., 1981	Please also see Barrow G.M., 1951.; GT
57.11 ± 0.11	398.15
58.000	405.7
59.89 ± 0.12	423.15
62.86 ± 0.13	448.15
64.699	462.5
65.69 ± 0.13	473.15
68.35 ± 0.14	498.15
70.600	522.7
70.98 ± 0.14	523.15

Constant pressure heat capacity of gas

C_p,gas (cal/mol*K)	Temperature (K)	Reference	Comment
34.601	200.	Scott D.W., 1974, 2	Recommended values were obtained from the consistent correlation scheme for alkanes [ Scott D.W., 1974, Scott D.W., 1974, 2]. This approach gives a better agreement with experimental data than the statistical thermodynamics calculation [ Pitzer K.S., 1944, Pitzer K.S., 1946].; GT
41.991	273.15
44.88 ± 0.1	298.15
45.100	300.
57.299	400.
68.549	500.
78.100	600.
86.099	700.
92.801	800.
98.401	900.
103.10	1000.
107.20	1100.
110.70	1200.
114.00	1300.
117.00	1400.
119.00	1500.

Condensed phase thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, References, Notes

Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DH - Eugene S. Domalski and Elizabeth D. Hearing

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_liquid	-59.82 ± 0.42	kcal/mol	Ccb	Good, 1972	ALS
Δ_fH°_liquid	-59.74 ± 0.20	kcal/mol	Ccb	Prosen and Rossini, 1945	see Prosen and Rossini, 1944; ALS
Quantity	Value	Units	Method	Reference	Comment
Δ_cH°_liquid	-1300. ± 30.	kcal/mol	AVG	N/A	Average of 6 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
S°_liquid	86.329	cal/mol*K	N/A	Finke, Gross, et al., 1954	DH
S°_liquid	85.99	cal/mol*K	N/A	Huffman, Parks, et al., 1931	Extrapolation below 90 K, 75.73 J/mol*K.; DH
S°_liquid	85.99	cal/mol*K	N/A	Parks, Huffman, et al., 1930	Extrapolation below 90 K, 77.19 J/mol*K.; DH

Constant pressure heat capacity of liquid

C_p,liquid (cal/mol*K)	Temperature (K)	Reference	Comment
60.87	299.	Czarnota, 1993	DH
62.667	318.15	Banipal, Garg, et al., 1991	T = 318 to 373 K. p = 0.1 MPa.; DH
61.109	298.15	Trejo, Costas, et al., 1991	DH
61.109	298.15	Andreoli-Ball, Patterson, et al., 1988	DH
61.109	298.15	Perez-Casas, Aicart, et al., 1988	DH
60.734	298.15	Benson and D'Arcy, 1986	DH
61.109	298.15	Tardajos, Aicart, et al., 1986	DH
60.750	298.15	Lainez, Grolier, et al., 1985	DH
60.641	298.15	Lainez, Rodrigo, et al., 1985	DH
60.33	297.54	Grigor'ev and Andolenko, 1984	T = 297 to 410 K. Unsmoothed experimental datum given as 2.210 KJ/kg*K.; DH
60.712	298.15	Roux, Grolier, et al., 1984	DH
60.33	298.	Zaripov, 1982	T = 298, 323, 363 K.; DH
60.724	298.15	Grolier, Inglese, et al., 1981	DH
60.449	298.15	Shakirov and Lyubarskii, 1980	T = 65 to 300 K.; DH
60.52	298.	Grigor'ev, Rastorguev, et al., 1975	T = 305 to 463 K.; DH
60.741	298.15	Finke, Gross, et al., 1954	T = 12 to 300 K.; DH
60.691	299.8	Connolly, Sage, et al., 1951	T = 80 to 200 F.; DH
60.681	298.15	Osborne and Ginnings, 1947	T = 293 to 318 K.; DH
60.11	298.3	Huffman, Parks, et al., 1931	T = 92 to 298 K. Value is unsmoothed experimental datum.; DH
59.20	293.7	Parks, Huffman, et al., 1930	T = 85 to 294 K. Value is unsmoothed experimental datum.; DH

Phase change data

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, References, Notes

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

Quantity	Value	Units	Method	Reference	Comment
T_boil	398.7 ± 0.5	K	AVG	N/A	Average of 75 out of 89 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_fus	216.3 ± 0.3	K	AVG	N/A	Average of 39 out of 41 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_triple	216.2 ± 0.6	K	AVG	N/A	Average of 9 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_c	568.9 ± 0.5	K	AVG	N/A	Average of 23 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
P_c	24.6 ± 0.1	atm	AVG	N/A	Average of 12 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
V_c	0.492	l/mol	N/A	Ambrose and Tsonopoulos, 1995
Quantity	Value	Units	Method	Reference	Comment
ρ_c	2.034 ± 0.007	mol/l	AVG	N/A	Average of 7 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
Δ_vapH°	10. ± 1.	kcal/mol	AVG	N/A	Average of 10 values; Individual data points

Enthalpy of vaporization

Δ_vapH (kcal/mol)	Temperature (K)	Method	Reference	Comment
8.224	398.8	N/A	Majer and Svoboda, 1985
9.42	338.	EB	Ewing and Ochoa, 2003	Based on data from 323. to 563. K.; AC
9.80	312.	A	Stephenson and Malanowski, 1987	Based on data from 297. to 400. K.; AC
10.6	263.	A	Stephenson and Malanowski, 1987	Based on data from 216. to 278. K.; AC
8.68	411.	A	Stephenson and Malanowski, 1987	Based on data from 396. to 432. K.; AC
8.48	443.	A	Stephenson and Malanowski, 1987	Based on data from 428. to 510. K.; AC
8.34	521.	A	Stephenson and Malanowski, 1987	Based on data from 506. to 569. K.; AC
9.85	310.	N/A	Paul, Krug, et al., 1986	Based on data from 295. to 402. K.; AC
10.0	313.	N/A	Michou-Saucet, Jose, et al., 1984	Based on data from 298. to 333. K.; AC
9.68 ± 0.02	313.	C	Majer, Svoboda, et al., 1979	AC
9.35 ± 0.02	333.	C	Majer, Svoboda, et al., 1979	AC
9.03 ± 0.02	353.	C	Majer, Svoboda, et al., 1979	AC
10.3	282.	N/A	Carruth and Kobayashi, 1973	Based on data from 217. to 297. K.; AC
9.08 ± 0.02	311.	C	McKay and Sage, 1960	AC
8.77 ± 0.02	328.	C	McKay and Sage, 1960	AC
8.46 ± 0.02	344.	C	McKay and Sage, 1960	AC
9.37	341.	MM	Willingham, Taylor, et al., 1945	Based on data from 326. to 400. K.; AC

Enthalpy of vaporization

Δ_vapH = A exp(-αT_r) (1 − T_r)^β
Δ_vapH = Enthalpy of vaporization (at saturation pressure) (kcal/mol)
T_r = reduced temperature (T / T_c)

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Temperature (K)	298. to 426.
A (kcal/mol)	13.97
α	0.1834
β	0.3324
T_c (K)	568.8
Reference	Majer and Svoboda, 1985

Antoine Equation Parameters

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

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Temperature (K)	A	B	C	Reference	Comment
216.59 to 297.10	5.1955	1936.281	-20.143	Carruth and Kobayashi, 1973	Coefficents calculated by NIST from author's data.
326.08 to 399.72	4.04296	1355.126	-63.633	Williamham, Taylor, et al., 1945

Enthalpy of sublimation

Δ_subH (kcal/mol)	Temperature (K)	Method	Reference	Comment
16.3	216.	B	Bondi, 1963	AC

Enthalpy of fusion

Δ_fusH (kcal/mol)	Temperature (K)	Method	Reference	Comment
4.9570	216.38	N/A	Finke, Gross, et al., 1954	DH
5.21	216.6	DSC	Mondieig, Rajabalee, et al., 2004	AC
4.957	216.4	N/A	Domalski and Hearing, 1996	AC
4.9359	215.8	N/A	Huffman, Parks, et al., 1931	DH
4.8021	215.6	N/A	Parks, Huffman, et al., 1930	DH

Entropy of fusion

Δ_fusS (cal/mol*K)	Temperature (K)	Reference	Comment
22.91	216.38	Finke, Gross, et al., 1954	DH
22.9	215.8	Huffman, Parks, et al., 1931	DH
22.27	215.6	Parks, Huffman, et al., 1930	DH

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Notes

Good, 1972
Good, W.D., The enthalpies of combustion and formation of n-octane and 2,2,3,3-tetramethylbutane, J. Chem. Thermodyn., 1972, 4, 709-714. [all data]

Prosen and Rossini, 1945
Prosen, E.J.; Rossini, F.D., Heats of combustion and formation of the paraffin hydrocarbons at 25° C, J. Res. NBS, 1945, 263-267. [all data]

Prosen and Rossini, 1944
Prosen, E.J.; Rossini, F.D., Heats of combustion of eight normal paraffin hydrocarbons in the liquid state, J. Res. NBS, 1944, 33, 255-272. [all data]

Scott D.W., 1974
Scott D.W., Correlation of the chemical thermodynamic properties of alkane hydrocarbons, J. Chem. Phys., 1974, 60, 3144-3165. [all data]

Messerly J.F., 1967
Messerly J.F., Low-temperature thermal data for n-pentane, n-heptadecane, and n-octadecane. Revised thermodynamic functions for the n-alkanes, C5-C18, J. Chem. Eng. Data, 1967, 12, 338-346. [all data]

Hossenlopp I.A., 1981
Hossenlopp I.A., Vapor heat capacities and enthalpies of vaporization of five alkane hydrocarbons, J. Chem. Thermodyn., 1981, 13, 415-421. [all data]

Barrow G.M., 1951
Barrow G.M., Experimental vapor heat capacities and heats of vaporization of seven octanes, J. Am. Chem. Soc., 1951, 73, 1824-1826. [all data]

Scott D.W., 1974, 2
Scott D.W., Chemical Thermodynamic Properties of Hydrocarbons and Related Substances. Properties of the Alkane Hydrocarbons, C1 through C10 in the Ideal Gas State from 0 to 1500 K. U.S. Bureau of Mines, Bulletin 666, 1974. [all data]

Pitzer K.S., 1944
Pitzer K.S., Thermodynamics of gaseous paraffins. Specific heat and related properties, Ind. Eng. Chem., 1944, 36, 829-831. [all data]

Pitzer K.S., 1946
Pitzer K.S., The entropies and related properties of branched paraffin hydrocarbons, Chem. Rev., 1946, 39, 435-447. [all data]

Finke, Gross, et al., 1954
Finke, H.L.; Gross, M.E.; Waddington, G.; Huffman, H.M., Low-temperature thermal data for the nine normal paraffin hydrocarbons from octane to hexadecane, J. Am. Chem. Soc., 1954, 76, 333-341. [all data]

Huffman, Parks, et al., 1931
Huffman, H.M.; Parks, G.S.; Barmore, M., Thermal data on organic compounds. X. Further studies on the heat capacities, entropies and free energies of hydrocarbons, J. Am. Chem. Soc., 1931, 53, 3876-3888. [all data]

Parks, Huffman, et al., 1930
Parks, G.S.; Huffman, H.M.; Thomas, S.B., Thermal data on organic compounds. VI. The heat capacities, entropies and free energies of some saturated, non-benzenoid hydrocarbons, J. Am. Chem. Soc., 1930, 52, 1032-1041. [all data]

Czarnota, 1993
Czarnota, I., Heat capacity of octane at high pressures, J. Chem. Thermodynam., 1993, 25, 355-359. [all data]

Banipal, Garg, et al., 1991
Banipal, T.S.; Garg, S.K.; Ahluwalia, J.C., Heat capacities and densities of liquid n-octane, n-nonane, n-decane, and n-hexadecane at temperatures from 318.15 to 373.15 K and at pressures up to 10 MPa, J. Chem. Thermodynam., 1991, 23, 923-931. [all data]

Trejo, Costas, et al., 1991
Trejo, L.M.; Costas, M.; Patterson, D., Excess heat capacity of organic mixtures, Internat. DATA Series, Selected Data Mixt., 1991, Ser. [all data]

Andreoli-Ball, Patterson, et al., 1988
Andreoli-Ball, L.; Patterson, D.; Costas, M.; Caceres-Alonso, M., Heat capacity and corresponding states in alkan-1-ol-n-alkane systems, J. Chem. Soc., Faraday Trans. 1, 1988, 84(11), 3991-4012. [all data]

Perez-Casas, Aicart, et al., 1988
Perez-Casas, S.; Aicart, E.; Trojo, L.M.; Costas, M., Excess heat capacity. Chlorobenzene-2,2,4,4,6,8,8-heptamethylnonane, Int. Data Ser., Sel. Data Mixtures, 1988, (2)A, 123. [all data]

Benson and D'Arcy, 1986
Benson, G.C.; D'Arcy, P.J., Heat capacities of binary mixtures of n-octane with each of the hexane isomers at 298.15 K, Can. J. Chem., 1986, 64, 2139-2141. [all data]

Tardajos, Aicart, et al., 1986
Tardajos, G.; Aicart, E.; Costas, M.; Patterson, D., Liquid structure and second-order mixing functions for benzene, toluene, and p-xylene with n-alkanes, J. Chem. Soc., Faraday Trans., 1986, 1 82, 2977-2987. [all data]

Lainez, Grolier, et al., 1985
Lainez, A.; Grolier, J.-P.E.; Wilhelm, E., Excess molar heat capacity and excess molar volume of 1,6-dichlorohexane + n-octane, Thermochim. Acta, 1985, 91, 243-248. [all data]

Lainez, Rodrigo, et al., 1985
Lainez, A.; Rodrigo, M.; Roux, A.H.; Grolier, J.-P.E.; Wilhelm, E., Relations between structure and thermodynamic properties. Heat capacities of polar substances (nitrobenzene and benzonitrile) in alkane solutions, Calorim. Anal. Therm., 1985, 16, 153-158. [all data]

Grigor'ev and Andolenko, 1984
Grigor'ev, B.A.; Andolenko, R.A., Investigation of the isobaric heat capacity of n-paraffinic hydrocarbons at atmospheric pressure, Izv. Vyssh. Ucheb. Zaved., Neft i Gaz, 1984, (2), 60-62. [all data]

Roux, Grolier, et al., 1984
Roux, A.H.; Grolier, J.-P.E.; Inglese, A.; Wilhelm, E., Excess molar enthalpies, excess molar heat capacities and excess molar volumes of (fluorobenzene + an n-alkane), Ber. Bunsenges. Phys. Chem., 1984, 88, 986-992. [all data]

Zaripov, 1982
Zaripov, Z.I., Experimental study of the isobaric heat capacity of liquid organic compounds with molecular weights of up to 4000 a.e.m., 1982, Teplomassoobmen Teplofiz. [all data]

Grolier, Inglese, et al., 1981
Grolier, J.P.E.; Inglese, A.; Roux, A.H.; Wilhelm, E., Thermodynamics of (1-chloronaphthalene + n-alkane): excess enthalpies, excess volumes and excess heat capacities, Ber. Bunsenges. Phys. Chem., 1981, 85, 768-772. [all data]

Shakirov and Lyubarskii, 1980
Shakirov, R.F.; Lyubarskii, M.V., Low-temperature heat capacity and thermodynamic functions of methyl trichlorothioacrylate, SPSTL Deposited Publication 3 KhP-D80, 1980, 19p. [all data]

Grigor'ev, Rastorguev, et al., 1975
Grigor'ev, B.A.; Rastorguev, Yu.L.; Yanin, G.S., Experimental determination of the isobaric specific heat of n-alkanes, Iz. Vyssh. Uchebn. Zaved. Neft Gaz 18, 1975, No.10, 63-66. [all data]

Connolly, Sage, et al., 1951
Connolly, T.J.; Sage, B.H.; Lacey, W.N., Isobaric heat capacities at bubble point. n-Hexane, methylcyclopentane, and n-octane, Ind. Eng. Chem., 1951, 43, 946-950. [all data]

Osborne and Ginnings, 1947
Osborne, N.S.; Ginnings, D.C., Measurements of heat of vaporization and heat capacity of a number of hydrocarbons, J. Res. NBS, 1947, 39, 453-477. [all data]

Ambrose and Tsonopoulos, 1995
Ambrose, D.; Tsonopoulos, C., Vapor-Liquid Critical Properties of Elements and Compounds. 2. Normal Alkenes, J. Chem. Eng. Data, 1995, 40, 531-546. [all data]

Majer and Svoboda, 1985
Majer, V.; Svoboda, V., Enthalpies of Vaporization of Organic Compounds: A Critical Review and Data Compilation, Blackwell Scientific Publications, Oxford, 1985, 300. [all data]

Ewing and Ochoa, 2003
Ewing, M.B.; Ochoa, J.C. Sanchez, The vapour pressures of n-octane determined using comparative ebulliometry, Fluid Phase Equilibria, 2003, 210, 2, 277-285, https://doi.org/10.1016/S0378-3812(03)00174-2 . [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]

Paul, Krug, et al., 1986
Paul, Hanns-Ingolf; Krug, Joseph; Knapp, Helmut, Measurements of VLE, hE and vE for binary mixtures of n-alkanes with n-alkylbenzenes, Thermochimica Acta, 1986, 108, 9-27, https://doi.org/10.1016/0040-6031(86)85073-0 . [all data]

Michou-Saucet, Jose, et al., 1984
Michou-Saucet, Marie-Annie; Jose, Jacques; Michou-Saucet, Christian; Merlin, J.C., Pressions de vapeur et enthalpies libres d'exces de systemes binaires: Hexamethylphosphorotriamide (HMPT) + n-hexane; n-heptane; n-octane: A 298,15 K; 303,15 K; 313,15 K; 323,15 K; 333,15 K, Thermochimica Acta, 1984, 75, 1-2, 85-106, https://doi.org/10.1016/0040-6031(84)85009-1 . [all data]

Majer, Svoboda, et al., 1979
Majer, Vladimír; Svoboda, Václav; Hála, Slavoj; Pick, Jirí, Temperature dependence of heats of vaporization of saturated hydrocarbons C5-C8; Experimental data and an estimation method, Collect. Czech. Chem. Commun., 1979, 44, 3, 637-651, https://doi.org/10.1135/cccc19790637 . [all data]

Carruth and Kobayashi, 1973
Carruth, Grant F.; Kobayashi, Riki, Vapor pressure of normal paraffins ethane through n-decane from their triple points to about 10 mm mercury, J. Chem. Eng. Data, 1973, 18, 2, 115-126, https://doi.org/10.1021/je60057a009 . [all data]

McKay and Sage, 1960
McKay, R.A.; Sage, B.H., Latent Heat of Vaporization for n-Octane., J. Chem. Eng. Data, 1960, 5, 1, 21-24, https://doi.org/10.1021/je60005a005 . [all data]

Willingham, Taylor, et al., 1945
Willingham, C.B.; Taylor, W.J.; Pignocco, J.M.; Rossini, F.D., Vapor pressures and boiling points of some paraffin, alkylcyclopentane, alkylcyclohexane, and alkylbenzene hydrocarbons, J. RES. NATL. BUR. STAN., 1945, 35, 3, 219-17, https://doi.org/10.6028/jres.035.009 . [all data]

Williamham, Taylor, et al., 1945
Williamham, C.B.; Taylor, W.J.; Pignocco, J.M.; Rossini, F.D., Vapor Pressures and Boiling Points of Some Paraffin, Alkylcyclopentane, Alkylcyclohexane, and Alkylbenzene Hydrocarbons, J. Res. Natl. Bur. Stand. (U.S.), 1945, 35, 3, 219-244, https://doi.org/10.6028/jres.035.009 . [all data]

Bondi, 1963
Bondi, A., Heat of Siblimation of Molecular Crystals: A Catalog of Molecular Structure Increments., J. Chem. Eng. Data, 1963, 8, 3, 371-381, https://doi.org/10.1021/je60018a027 . [all data]

Mondieig, Rajabalee, et al., 2004
Mondieig, D.; Rajabalee, F.; Metivaud, V.; Oonk, H.A.J.; Cuevas-Diarte, M.A., n -Alkane Binary Molecular Alloys, Chem. Mater., 2004, 16, 5, 786-798, https://doi.org/10.1021/cm031169p . [all data]

Domalski and Hearing, 1996
Domalski, Eugene S.; Hearing, Elizabeth D., Heat Capacities and Entropies of Organic Compounds in the Condensed Phase. Volume III, J. Phys. Chem. Ref. Data, 1996, 25, 1, 1, https://doi.org/10.1063/1.555985 . [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, References

Symbols used in this document:

C_p,gas	Constant pressure heat capacity of gas
C_p,liquid	Constant pressure heat capacity of liquid
P_c	Critical pressure
S°_gas	Entropy of gas at standard conditions
S°_liquid	Entropy of liquid at standard conditions
T_boil	Boiling point
T_c	Critical temperature
T_fus	Fusion (melting) point
T_triple	Triple point temperature
V_c	Critical volume
Δ_cH°_liquid	Enthalpy of combustion of liquid at standard conditions
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_fH°_liquid	Enthalpy of formation of liquid at standard conditions
Δ_fusH	Enthalpy of fusion
Δ_fusS	Entropy of fusion
Δ_subH	Enthalpy of sublimation
Δ_vapH	Enthalpy of vaporization
Δ_vapH°	Enthalpy of vaporization at standard conditions
ρ_c	Critical density

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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