Section: 6 | Recommended Data for Vapor-Pressure Calibration |

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RECOMMENDED DATA FOR VAPOR-PRESSURE CALIBRATION

Eric W. Lemmon

These precise vapor pressure values for several compounds are recommended as secondary standards. Values are given in kPa (1 kPa = 0.0098692 atm = 7.5006 Torr). The four tables below give vapor pressure values in the temperature range 180 K to 500 K. Column definitions for Tables 1-4 are as follows.

Column heading	Definition
Name	Name of compound
Mol. form.	Molecular formula of compound
State	Physical state
P_vap(temperature)	Vapor pressure in kPa at temperature indicated by value in K within parentheses

References for water and CO₂ are given in the "Thermophysical Properties of Fluids" table in this Section. The unpublished equations of state for pentane and benzene are available in the REFPROP version 10 software (see Ref. 1).

References

Lemmon, E.W., Bell, I.H., Huber, M.L., McLinden, M.O. NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 10.0, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, 2018. <http://www.nist.gov/srd/refprop>
Huber, M. L., Laesecke, A., and Friend, D. G., Correlation for the Vapor Pressure of Mercury, Ind. Eng. Chem. Res. 45, 7351, 2006. [https://doi.org/10.1021/ie060560s]
Ruzicka, K., Fulem, M., and Ruzicka, V., Recommended Vapor Pressure of Solid Naphthalene, J. Chem. Eng. Data, 50, 1956, 2005. [https://doi.org/10.1021/je050216m]
Thol, M., Uhde, T., Lemmon, E.W., and Span, R., Fundamental Equations of State for Hydrocarbons. Part I. n-Pentane, to be published in J. Phys. Chem. Ref. Data, 2019.
Thol, M., Lemmon, E.W., and Span, R., Equation of State for Benzene for Temperatures from the Melting Line up to 725 K and Pressures up to 500 MPa, to be published in J. Chem. Eng. Data, 2019.

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TABLE 1. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 180 K to 280 K

Name	Mol. form.	State	P_vap(180 K)/kPa	P_vap(190 K)/kPa	P_vap(200 K)/kPa	P_vap(210 K)/kPa	P_vap(220 K)/kPa	P_vap(230 K)/kPa	P_vap(240 K)/kPa	P_vap(250 K)/kPa	P_vap(260 K)/kPa	P_vap(270 K)/kPa	P_vap(280 K)/kPa
Naphthalene	C₁₀H₈(s)	sol	3.04×10^-11	4.33×10^-10	4.69×10^-9	4.02×10^-8	2.82×10^-7	1.66×10^-6	8.37×10^-6	3.69×10^-5	1.446×10^-4	5.09×10^-4	0.00163
Ice	H₂O(s)	sol			0.00016	0.0007	0.0027	0.0089	0.0273	0.0760	0.1958	0.4701
Water	H₂O(l)	liq											0.992
Benzene	C₆H₆	liq											5.140
Carbon dioxide	CO₂(s)	sol	27.56	68.34	155.03	327.09
Pentane	C₅H₁₂	liq								7.590	12.97	21.15	33.11

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TABLE 2. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 290 K to 390 K

Name	Mol. form.	State	P_vap(290 K)/kPa	P_vap(300 K)/kPa	P_vap(310 K)/kPa	P_vap(320 K)/kPa	P_vap(330 K)/kPa	P_vap(340 K)/kPa	P_vap(350 K)/kPa	P_vap(360 K)/kPa	P_vap(370 K)/kPa	P_vap(380 K)/kPa	P_vap(390 K)/kPa
Naphthalene	C₁₀H₈(s)	sol	0.004798	0.01308	0.03328	0.07956	0.1797	0.3854	0.7884
Water	H₂O(l)	liq	1.920	3.537	6.231	10.546	17.213	27.188	41.682	62.194	90.535	128.85	179.64
Benzene	C₆H₆	liq	8.603	13.82	21.40	32.07	46.68	66.19	91.67	124.3	165.3	216.0	278.0
Pentane	C₅H₁₂	liq	50.01	73.18	104.1	144.4	195.8	260.2	339.7	436.3	552.2	689.7	851.2

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TABLE 3. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 400 K to 500 K

Name	Mol. form.	State	P_vap(400 K)/kPa	P_vap(410 K)/kPa	P_vap(420 K)/kPa	P_vap(430 K)/kPa	P_vap(440 K)/kPa	P_vap(450 K)/kPa	P_vap(460 K)/kPa	P_vap(470 K)/kPa	P_vap(480 K)/kPa	P_vap(490 K)/kPa	P_vap(500 K)/kPa
Water	H₂O(l)	liq	245.77	330.45	437.30	570.26	733.67	932.20	1170.9	1455.1	1790.5	2183.1	2639.2
Benzene	C₆H₆	liq	352.5	441.3	545.9	668.0	809.2	971.5	1157	1366	1603	1868	2165
Pentane	C₅H₁₂	liq	1039	1257	1506	1791	2115	2483	2902
Mercury	Hg	liq	0.139	0.216	0.330	0.494	0.726	1.048	1.489	2.082	2.870	3.905	5.245

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TABLE 4. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 510 K to 600 K

Name	Mol. form.	State	P_vap(510 K)/kPa	P_vap(520 K)/kPa	P_vap(530 K)/kPa	P_vap(540 K)/kPa	P_vap(550 K)/kPa	P_vap(560 K)/kPa	P_vap(570 K)/kPa	P_vap(580 K)/kPa	P_vap(590 K)/kPa	P_vap(600 K)/kPa
Water	H₂O(l)	liq	3165.5	3769.0	4456.9	5236.9	6117.2	7106.2	8213.2	9448.0	10821	12345
Benzene	C₆H₆	liq	2495	2862	3269	3721	4222	4784
Mercury	Hg	liq	6.962	9.139	11.871	15.267	19.452	24.564	30.76	38.22	47.12	57.69

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RECOMMENDED DATA FOR VAPOR-PRESSURE CALIBRATION

References

TABLE 1. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 180 K to 280 K

TABLE 2. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 290 K to 390 K

TABLE 3. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 400 K to 500 K

TABLE 4. Vapor Pressure for Vapor-Pressure Calibration in Temperature Range 510 K to 600 K

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