Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

NOTICE: Due to scheduled maintenance at our Gaithersburg campus, this site will not be available from 5:00 pm EDT (21:00 UTC) on Friday October 25 until 5:00 pm (21:00 UTC) on Sunday October 27. We apologize for any inconvenience this outage may cause.


Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.

Enthalpy of vaporization at standard conditions (nominally 298.15 K, 1 atm.)

Go To: Top, References, Notes

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:
AC - William E. Acree, Jr., James S. Chickos
ALS - Hussein Y. Afeefy, Joel F. Liebman, and Stephen E. Stein
DRB - Donald R. Burgess, Jr.

DeltavapH° (kJ/mol) Method Reference Comment
40.21N/AMajer and Svoboda, 1985 
40.5 ± 1.1CGCLipkind and Chickos, 2009Based on data from 342. - 373. K.; AC
40.16 ± 0.06N/AChirico, Steele, et al., 1996AC
40.4CGCChickos, Hosseini, et al., 1995Based on data from 323. - 373. K.; AC
40.15VMajer, Svoboda, et al., 1984ALS
40.2CMajer, Svoboda, et al., 1984AC
40.2N/AHubbard, Frow, et al., 1961DRB
40.40VAndon, Cox, et al., 1957ALS
40.2 ± 0.3VMcCullough, Douslin, et al., 1957ALS
40.5N/ACox, Challoner, et al., 1954DRB
35.5 ± 0.04VMathews, 1926ALS; Data excluded from overall average


Go To: Top, Enthalpy of vaporization at standard conditions (nominally 298.15 K, 1 atm.), Notes

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

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]

Lipkind and Chickos, 2009
Lipkind, Dmitri; Chickos, James S., An examination of the vaporization enthalpies and vapor pressures of pyrazine, pyrimidine, pyridazine, and 1,3,5-triazine, Struct Chem, 2009, 20, 1, 49-58, https://doi.org/10.1007/s11224-008-9389-5 . [all data]

Chirico, Steele, et al., 1996
Chirico, R.D.; Steele, W.V.; Nguyen, A.; Klots, T.D.; Knipmeyer, S.E., Thermodynamic properties of pyridine---I. Vapor pressures, high-temperature heat capacities, densities, critical properties, derived thermodynamic functions, vibrational assignment, and derivation of recommended values, The Journal of Chemical Thermodynamics, 1996, 28, 8, 797-818, https://doi.org/10.1006/jcht.1996.0073 . [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]

Majer, Svoboda, et al., 1984
Majer, V.; Svoboda, V.; Lencka, M., Enthalpies of vaporization and cohesive energies of pyridine and isomeric methylpyridines, J. Chem. Thermodyn., 1984, 16, 1019-1024. [all data]

Hubbard, Frow, et al., 1961
Hubbard, W.N.; Frow, F.R.; Waddington, G., The heats of combustion and formation of pyridine and hippuric acid, J. Phys. Chem., 1961, 65, 1326-1328. [all data]

Andon, Cox, et al., 1957
Andon, R.J.L.; Cox, J.D.; Herington, E.F.G.; Martin, J.F., The second virial coefficients of pyridine and benzene, and certain of their methyl homologues, Trans. Faraday Soc., 1957, 53, 1074. [all data]

McCullough, Douslin, et al., 1957
McCullough, J.P.; Douslin, D.R.; Messerly, J.F.; Hossenlopp, I.A.; Kincheloe, T.C.; Waddington, G., Pyridine: Experimental and calculated chemical thermodynamic properties between 0 and 1500°K.; a revised vibrational assignment, J. Am. Chem. Soc., 1957, 79, 4289-42. [all data]

Cox, Challoner, et al., 1954
Cox, J.D.; Challoner, A.R.; Meetham, A.R., The heats of combustion of pyridine and certain of its derivatives, J. Chem. Soc., 1954, 265-271. [all data]

Mathews, 1926
Mathews, J.H., The accurate measurement of heats of vaporization of liquids, J. Am. Chem. Soc., 1926, 48, 562-576. [all data]


Go To: Top, Enthalpy of vaporization at standard conditions (nominally 298.15 K, 1 atm.), References