Tetrafluoromethane

Formula: CF₄
Molecular weight: 88.0043
IUPAC Standard InChI: InChI=1S/CF4/c2-1(3,4)5
IUPAC Standard InChIKey: TXEYQDLBPFQVAA-UHFFFAOYSA-N
CAS Registry Number: 75-73-0
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.
Other names: Carbon tetrafluoride; Methane, tetrafluoro-; Arcton 0; Carbon fluoride (CF4); Freon 14; FC 14; Perfluoromethane; CF4; Halon 14; Carbon fluoride; F 14; Halocarbon 14; R 14; UN 1982; Refrigerant 14; CFC 14; R 14 (Refrigerant); Refrigerant R 14; Methane, tetrafluo-
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Gas phase thermochemistry data

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Data compiled as indicated in comments:
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein

Quantity	Value	Units	Method	Reference	Comment
Δ_fH°_gas	-221. ± 6.	kcal/mol	AVG	N/A	Average of 12 out of 13 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
S°_{gas,1 bar}	62.478	cal/mol*K	Review	Chase, 1998	Data last reviewed in June, 1969

Gas Phase Heat Capacity (Shomate Equation)

C_p° = A + B*t + C*t² + D*t³ + E/t²
H° − H°_298.15= A*t + B*t²/2 + C*t³/3 + D*t⁴/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t²/2 + D*t³/3 − E/(2*t²) + G
C_p = heat capacity (cal/mol*K)
H° = standard enthalpy (kcal/mol)
S° = standard entropy (cal/mol*K)
t = temperature (K) / 1000.

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View table.

Temperature (K)	298. to 1000.	1000. to 6000.
A	3.816392	25.38769
B	50.27051	0.257199
C	-45.28339	-0.053344
D	14.86670	0.003765
E	-0.051940	-1.993470
F	-226.2160	-236.0840
G	53.69900	85.08040
H	-223.0400	-223.0400
Reference	Chase, 1998	Chase, 1998
Comment	Data last reviewed in June, 1969	Data last reviewed in June, 1969

Condensed phase thermochemistry data

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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_cH°_liquid	-363.262	kcal/mol	Ccb	Price and Sapiano, 1979	ALS
Δ_cH°_liquid	-531.14	kcal/mol	Ccb	Krech, Price, et al., 1973	ALS
Quantity	Value	Units	Method	Reference	Comment
S°_liquid	34.410	cal/mol*K	N/A	Smith and Pace, 1969	DH

Constant pressure heat capacity of liquid

C_p,liquid (cal/mol*K)	Temperature (K)	Reference	Comment
19.14	145.	Smith and Pace, 1969	T = 12 to 145 K. See also 69SMI/PAC.; DH

Phase change data

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Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
DH - Eugene S. Domalski and Elizabeth D. Hearing
AC - William E. Acree, Jr., James S. Chickos
CAL - James S. Chickos, William E. Acree, Jr., Joel F. Liebman, Students of Chem 202 (Introduction to the Literature of Chemistry), University of Missouri -- St. Louis

Quantity	Value	Units	Method	Reference	Comment
T_boil	145.1 ± 0.2	K	AVG	N/A	Average of 9 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_fus	89.	K	N/A	Streng, 1971	Uncertainty assigned by TRC = 1.5 K; TRC
T_fus	89.5	K	N/A	Thorp and Scott, 1956	Uncertainty assigned by TRC = 0.5 K; TRC
T_fus	86.85	K	N/A	Ruff and Keim, 1930	Uncertainty assigned by TRC = 1. K; TRC
Quantity	Value	Units	Method	Reference	Comment
T_triple	89.4 ± 0.8	K	AVG	N/A	Average of 7 values; Individual data points
Quantity	Value	Units	Method	Reference	Comment
T_c	227.5	K	N/A	Altunin, Geller, et al., 1987	Uncertainty assigned by TRC = 0.1 K; TRC
T_c	227.5	K	N/A	Chari, 1960	Uncertainty assigned by TRC = 0.02 K; TRC
Quantity	Value	Units	Method	Reference	Comment
P_c	36.96	atm	N/A	Altunin, Geller, et al., 1987	Uncertainty assigned by TRC = 0.099 atm; TRC
Quantity	Value	Units	Method	Reference	Comment
V_c	0.142	l/mol	N/A	Terry, Lynch, et al., 1969	Uncertainty assigned by TRC = 800. l/mol; TRC
Quantity	Value	Units	Method	Reference	Comment
ρ_c	7.155	mol/l	N/A	Altunin, Geller, et al., 1987	Uncertainty assigned by TRC = 0.01 mol/l; TRC

Enthalpy of vaporization

Δ_vapH (kcal/mol)	Temperature (K)	Method	Reference	Comment
2.8236	145.12	N/A	Smith and Pace, 1969	P = 101.325 kPa.; DH
2.89	212.	A	Stephenson and Malanowski, 1987	Based on data from 195. to 227. K.; AC
2.94	148.	A	Stephenson and Malanowski, 1987	Based on data from 89. to 163. K.; AC
2.84	182.	A	Stephenson and Malanowski, 1987	Based on data from 160. to 197. K.; AC
2.96	131.	N/A	Smith and Pace, 1969	Based on data from 116. to 146. K.; AC
3.06	131.	N/A	Menzel and Mohry, 1933	Based on data from 93. to 146. K. See also Stephenson and Malanowski, 1987.; AC

Entropy of vaporization

Δ_vapS (cal/mol*K)	Temperature (K)	Reference	Comment
19.46	145.12	Smith and Pace, 1969	P; DH

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
121.59 to 135.39	3.31456	376.716	-31.901	Regnier, 1972	Coefficents calculated by NIST from author's data.
89.71 to 101.46	0.62910	103.578	-61.461	Smith and Pace, 1969	Coefficents calculated by NIST from author's data.
92.51 to 145.87	4.1625	556.616	-11.43	Menzel and Mohry, 1933	Coefficents calculated by NIST from author's data.

Enthalpy of sublimation

Δ_subH (kcal/mol)	Temperature (K)	Method	Reference	Comment
3.51	88.	N/A	Simon, Knobler, et al., 1967	Based on data from 86. to 89. K.; AC
4.06	76.	N/A	Bondi, 1963	AC
3.35	83.	A	Menzel and Mohry, 1933	Based on data from 80. to 86. K.; AC

Enthalpy of fusion

Δ_fusH (kcal/mol)	Temperature (K)	Reference	Comment
0.17	89.56	Domalski and Hearing, 1996	AC

Entropy of fusion

Δ_fusS (cal/mol*K)	Temperature (K)	Reference	Comment
5.361	76.27	Domalski and Hearing, 1996	CAL
1.90	89.56
5.11	76.1
1.8	88.4
4.59	76.1
1.9	89.5

Enthalpy of phase transition

ΔH_trs (kcal/mol)	Temperature (K)	Initial Phase	Final Phase	Reference	Comment
0.34950	76.09	crystaline, II	crystaline, I	Enokida, Shinoda, et al., 1969	DH
0.1686	89.529	crystaline, I	liquid	Enokida, Shinoda, et al., 1969	DH
0.40851	76.27	crystaline, II	crystaline, I	Smith and Pace, 1969	DH
0.1702	89.56	crystaline, I	liquid	Smith and Pace, 1969	DH
0.41451	76.09	crystaline, II	crystaline, I	Kostryukov, Samorukov, et al., 1958	DH
0.16580	88.44	crystaline, I	liquid	Kostryukov, Samorukov, et al., 1958	DH

Entropy of phase transition

ΔS_trs (cal/mol*K)	Temperature (K)	Initial Phase	Final Phase	Reference	Comment
4.589	76.09	crystaline, II	crystaline, I	Enokida, Shinoda, et al., 1969	DH
1.88	89.529	crystaline, I	liquid	Enokida, Shinoda, et al., 1969	DH
5.356	76.27	crystaline, II	crystaline, I	Smith and Pace, 1969	DH
1.90	89.56	crystaline, I	liquid	Smith and Pace, 1969	DH
5.110	76.09	crystaline, II	crystaline, I	Kostryukov, Samorukov, et al., 1958	DH
1.85	88.44	crystaline, I	liquid	Kostryukov, Samorukov, et al., 1958	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:

Henry's Law data

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Data compiled by: Rolf Sander

Henry's Law constant (water solution)

k_H(T) = k°_H exp(d(ln(k_H))/d(1/T) ((1/T) - 1/(298.15 K)))
k°_H = Henry's law constant for solubility in water at 298.15 K (mol/(kg*bar))
d(ln(k_H))/d(1/T) = Temperature dependence constant (K)

k°_H (mol/(kg*bar))	d(ln(k_H))/d(1/T) (K)	Method	Reference	Comment
0.00019		Q	N/A	missing citation give several references for the Henry's law constants but don't assign them to specific species.
0.00021	1800.	L	N/A
0.00020		V	N/A
0.00020	1500.	M	N/A

Gas phase ion energetics data

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Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
LL - Sharon G. Lias and Joel F. Liebman
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

Quantity	Value	Units	Method	Reference	Comment
IE (evaluated)	≤14.7	eV	N/A	N/A	L
Quantity	Value	Units	Method	Reference	Comment
Proton affinity (review)	126.5	kcal/mol	N/A	Hunter and Lias, 1998	HL
Quantity	Value	Units	Method	Reference	Comment
Gas basicity	120.4	kcal/mol	N/A	Hunter and Lias, 1998	HL

Ionization energy determinations

IE (eV)	Method	Reference	Comment
16.2 ± 0.1	EI	Kime, Driscoll, et al., 1987	LBLHLM
15.3	PE	Novak, Potts, et al., 1985	LBLHLM
16.2	PE	Carlson, Fahlman, et al., 1984	LBLHLM
≤14.7	EVAL	Rosenstock, Draxl, et al., 1977	LLK
16.5	PE	Lloyd and Roberts, 1975	LLK
15.7	PE	Lloyd and Roberts, 1975	LLK
16.2	PE	Bieri, Asbrink, et al., 1981	Vertical value; LLK
16.26	PE	Uehara, Saito, et al., 1973	Vertical value; LLK
16.25 ± 0.04	PE	Jonas, Schweitzer, et al., 1973	Vertical value; LLK
16.20	EI	Harshbarger, Robin, et al., 1973	Vertical value; LLK

Appearance energy determinations

Ion	AE (eV)	Other Products	Method	Reference	Comment
C⁺	31.5 ± 0.5	?	EI	Dibeler, Reese, et al., 1956	RDSH
CF⁺	22.6 ± 0.5	?	EI	Dibeler, Reese, et al., 1956	RDSH
CF₂⁺	20.3 ± 0.5	?	EI	Dibeler, Reese, et al., 1956	RDSH
CF₃⁺	14.24 ± 0.07	F	END	Fischer and Armentrout, 1990	LL
CF₃⁺	14.2 ± 0.1	F	DER	Tichy, Javahery, et al., 1987	LBLHLM
CF₃⁺	14.7 ± 0.3	F	PI	Powis, 1980	LLK
CF₃⁺	14.9 ± 0.1	F	PIPECO	Simm, Danby, et al., 1975	LLK
CF₃⁺	≤14.84 ± 0.05	F	PIPECO	Brehm, Frey, et al., 1974	LLK
CF₃⁺	≤15.35	F	PI	Walter, Lifshitz, et al., 1969	RDSH
CF₃⁺	15.52 ± 0.02	F	PI	Noutary, 1968	RDSH
CF₃⁺	15.56 ± 0.01	F	PI	Cook and Ching, 1965	RDSH
F⁺	24.0 ± 1.0	?	EI	Bibby, Toubelis, et al., 1965	RDSH

References

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, Notes

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Price and Sapiano, 1979
Price, S.J.W.; Sapiano, H.J., Determination of ΔH°_f298(C₆F₁₀,g) and ΔH°_f298(C₆F₁₂,g) from studies of the combustion of decafluorocyclohexene and dodecafluorocylohexene in oxygen and calculation of the resonance energy of hexafluorobenzene, Can. J. Chem., 1979, 58, 685-688. [all data]

Krech, Price, et al., 1973
Krech, M.J.; Price, S.J.W.; Yared, W.F., Determination of the heat of formation of octafluorotoluene and calculation of D[C₆F₅-F] - D[C₆F₅-CF₃], Can. J. Chem., 1973, 51, 3662-3664. [all data]

Smith and Pace, 1969
Smith, J.H.; Pace, E.L., The thermodynamic properties of carbon tetrafluoride from 12°K to its boiling point. The significance of the parameter {nu}, J. Phys. Chem., 1969, 73, 4232-4236. [all data]

Streng, 1971
Streng, A.G., Miscibility and Compatibility of Some Liquid and Solidified Gases at Low Temperature, J. Chem. Eng. Data, 1971, 16, 357. [all data]

Thorp and Scott, 1956
Thorp, N.; Scott, R.L., Fluorocarbon solutions at low termperatures. I. The liquid mixtures CF4-CHF3, CF4-CH4, CF4-Kr, CH4-Kr., J. Phys. Chem., 1956, 60, 670. [all data]

Ruff and Keim, 1930
Ruff, O.; Keim, R., The reaction products of carbon with fluorine: I. Tetrafluoromethane., Z. Anorg. Allg. Chem., 1930, 192, 249. [all data]

Altunin, Geller, et al., 1987
Altunin, V.V.; Geller, V.Z.; Kremenvskaya, E.A.; Perel'shtein, I.I.; Petrov, E.K., Thermophysical Properties of Freons, Methane Ser. Part 2, Vol. 9, NSRDS-USSR, Selover, T. B., Ed., Hemisphere, New York, 1987. [all data]

Chari, 1960
Chari, N.C., Thermodynamic Properties of Carbon Tetrafluoride., Ph.D. Dissertation, Univ. Mich., Ann Arbour, MI, 1960. [all data]

Terry, Lynch, et al., 1969
Terry, M.J.; Lynch, J.T.; Bunclark, M.; Mansell, K.R.; Staveley, L.A.K., The Densities of Liquid Argon, Krypton, Xenon, Oxygen, Nitrogen, Carbon Monoxide, Methane and Carbon Tetrafluoride Along the Orthobaric Liquid Curve, J. Chem. Thermodyn., 1969, 1, 413. [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]

Menzel and Mohry, 1933
Menzel, Walter; Mohry, Friedrich, Die Dampfdrucke des CF4 und NF3 und der Tripelpunkt des CF4, Z. Anorg. Allg. Chem., 1933, 210, 3, 257-263, https://doi.org/10.1002/zaac.19332100305 . [all data]

Regnier, 1972
Regnier, J., Tension de Vapeur de L'Ethane Entre 80 et 135 K, J. Chim. Phys., 1972, 69, 942-944. [all data]

Simon, Knobler, et al., 1967
Simon, M.; Knobler, C.M.; Duncan, A.G., The vapour pressure of tetrafluoromethane from 86 to 146° K, Cryogenics, 1967, 7, 1-4, 138-140, https://doi.org/10.1016/S0011-2275(67)80053-5 . [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]

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]

Enokida, Shinoda, et al., 1969
Enokida, H.; Shinoda, T.; Mashiko, Y., Thermodynamic properties of carbon tetrafluoride from 40°K to its melting point, Bull. Chem. Soc. Japan, 1969, 42, 3415-3421. [all data]

Kostryukov, Samorukov, et al., 1958
Kostryukov, V.N.; Samorukov, O.P.; Strelkov, P.G., Thermodynamic studies at low temperatures VII. Phase transitions in solid BF₃, CF₄ and SiF₄, Zhur. Fiz. Khim., 1958, 32, 1354-1361. [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Kime, Driscoll, et al., 1987
Kime, Y.J.; Driscoll, D.C.; Dowben, P.A., The stability of the carbon tetrahalide ions, J. Chem. Soc. Faraday Trans. 2, 1987, 83, 403. [all data]

Novak, Potts, et al., 1985
Novak, I.; Potts, A.W.; Quinn, F.; Marr, G.V.; Dobson, B.; Hillier, I.H.; West, J.B., Photoelectron asymmetry measurements for CHF₃ and CF₄ in the photon energy range 19 to 80 eV, J. Phys. B:, 1985, 18, 1581. [all data]

Carlson, Fahlman, et al., 1984
Carlson, T.A.; Fahlman, A.; Svensson, W.A.; Krause, M.O.; Whitley, T.A.; Grimm, F.A.; Piancastelli, M.N.; Taylor, J.W., Angle-resolved photoelectron cross section of CF₄, J. Chem. Phys., 1984, 81, 3828. [all data]

Rosenstock, Draxl, et al., 1977
Rosenstock, H.M.; Draxl, K.; Steiner, B.W.; Herron, J.T., Energetics of gaseous ions, J. Phys. Chem. Ref. Data, 1977, 6. [all data]

Lloyd and Roberts, 1975
Lloyd, D.R.; Roberts, P.J., Photoelectron spectra of halides. VII. Variable temperature He(I) and He(II) studies of CF₄, SiF₄, and GeF₄, J. Electron Spectrosc. Relat. Phenom., 1975, 7, 325. [all data]

Bieri, Asbrink, et al., 1981
Bieri, G.; Asbrink, L.; Von Niessen, W., 30.4 nm He(II) photoelectron spectra of organic molecules. Part IV. Fluoro-compounds (C,H,F), J. Electron Spectrosc. Relat. Phenom., 1981, 23, 281. [all data]

Uehara, Saito, et al., 1973
Uehara, Y.; Saito, N.; Yonezawa, T., Ionization potentials of trifluoromethyl and methyl halides by photoelectron spectroscopy and calculations by extended Hucket and CNDO/2 methods, Chem. Lett., 1973, 495. [all data]

Jonas, Schweitzer, et al., 1973
Jonas, A.E.; Schweitzer, G.K.; Grimm, F.A.; Carlson, T.A., The photoelectron spectra of the tetrafluoro and tetramethyl compounds of the group IV elements, J. Electron Spectrosc. Relat. Phenom., 1973, 1, 29. [all data]

Harshbarger, Robin, et al., 1973
Harshbarger, W.R.; Robin, M.B.; Lassettre, E.N., The electron impact spectra of the fluoromethanes, J. Electron Spectrosc. Relat. Phenom., 1973, 1, 319. [all data]

Dibeler, Reese, et al., 1956
Dibeler, V.H.; Reese, R.M.; Mohler, F.L., Ionization and dissociation of the trifluoromethyl halides by electron impact, J. Res. NBS, 1956, 57, 113. [all data]

Fischer and Armentrout, 1990
Fischer, E.R.; Armentrout, P.B., The appearance energy of CF₃⁺ from CF₄: Ion/molecule reactions related to the thermochemistry of CF₃⁺., Int. J. Mass Spectrom. Ion Processes, 1990, 101, 1. [all data]

Tichy, Javahery, et al., 1987
Tichy, M.; Javahery, G.; Twiddy, N.D.; Ferguson, E.E., The thermal energy reactions HCl⁺ + SF₆ Ü SF₅⁺ + HF + Cl and HCl⁺ + CF₄ Ü CF₃⁺ + HF + Cl, Int. J. Mass Spectrom. Ion Processes, 1987, 79, 231. [all data]

Powis, 1980
Powis, I., The dissociation of state-selected CF₃X⁺ molecular ions, Mol. Phys., 1980, 39, 311. [all data]

Simm, Danby, et al., 1975
Simm, I.G.; Danby, C.J.; Eland, J.H.D.; Mansell, P.I., Translational energy release in the loss of fluorine atoms from the ions SF₆⁺, CF₄⁺ and C₂F₆⁺, J. Chem. Soc., 1975, 426. [all data]

Brehm, Frey, et al., 1974
Brehm, B.; Frey, R.; Kustler, A.; Eland, J.H.D., Kinetic energy release in ion fragmentation: N₂O⁺, COS⁺ and CF₄⁺ decays, Int. J. Mass Spectrom. Ion Processes, 1974, 79, 251. [all data]

Walter, Lifshitz, et al., 1969
Walter, T.A.; Lifshitz, C.; Chupka, W.A.; Berkowitz, J., Mass-spectrometric study of the photoionization of C₂F₄ and CF₄, J. Chem. Phys., 1969, 51, 3531. [all data]

Noutary, 1968
Noutary, C.J., Mass spectrometric study of some fluorocarbons and trifluoromethyl halides, J.Res. NBS, 1968, 72A, 479. [all data]

Cook and Ching, 1965
Cook, G.R.; Ching, B.K., Photoionization and absorption cross sections and fluorescence of CF₄, J. Chem. Phys., 1965, 43, 1794. [all data]

Bibby, Toubelis, et al., 1965
Bibby, M.M.; Toubelis, B.J.; Carter, G., Ionization and dissociation in CF₄, Electron. Letters, 1965, 1, 50. [all data]

Notes

Go To: Top, Gas phase thermochemistry data, Condensed phase thermochemistry data, Phase change data, Henry's Law data, Gas phase ion energetics data, References

Symbols used in this document:

AE	Appearance energy
C_p,liquid	Constant pressure heat capacity of liquid
IE (evaluated)	Recommended ionization energy
P_c	Critical pressure
S°_{gas,1 bar}	Entropy of gas at standard conditions (1 bar)
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
d(ln(k_H))/d(1/T)	Temperature dependence parameter for Henry's Law constant
k°_H	Henry's Law constant at 298.15K
ΔH_trs	Enthalpy of phase transition
ΔS_trs	Entropy of phase transition
Δ_cH°_liquid	Enthalpy of combustion of liquid at standard conditions
Δ_fH°_gas	Enthalpy of formation of gas at standard conditions
Δ_fusH	Enthalpy of fusion
Δ_fusS	Entropy of fusion
Δ_subH	Enthalpy of sublimation
Δ_vapH	Enthalpy of vaporization
Δ_vapS	Entropy of vaporization
ρ_c	Critical density

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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