Section: 6 | Thermophysical Properties of Air |

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The table 'TABLE 1. Thermophysical Properties of Air along the Boiling and Condensation Curves' has one or more different columns to those in the book version.
The table 'TABLE 2. Thermophysical Properties of Air along Various Isobars' has one or more different columns to those in the book version.

How to Cite this Reference

THERMOPHYSICAL PROPERTIES OF AIR

Eric W. Lemmon

These tables summarize the thermophysical properties of air in the liquid and gaseous states as calculated from the pseudo-pure fluid equation of state of Lemmon et al. (Ref. 1). Table 1 refers to liquid and gaseous air at equilibrium as a function of temperature. The tabulated properties are the bubble-point pressure; the dew-point pressure; density; enthalpy; entropy; isochoric heat capacity; isobaric heat capacity; speed of sound; viscosity; and thermal conductivity. The normal boiling point of air, i.e., the temperature at which the bubble-point pressure reaches 1 standard atmosphere (1.01325 bar), is 78.90 K (-194.25 °C). Column definitions for Tables 1 and 2 are as follows.

Column heading	Definition
T	Temperature, in K
P	Bubble-point pressure or dew-point pressure, in MPa [Not relevant for Table 2]
ρ	Density, in kg m^-3
H	Enthalpy, in units kJ kg^-1
S	Entropy, in units kJ kg^-1 K^-1
*C_v*	Isochoric heat capacity, in units kJ kg^-1 K^-1
*C_p*	Isobaric heat capacity, in units kJ kg^-1 K^-1
μ	Speed of sound, in units m s^-1
η	Viscosity, in units μPa s
λ	Thermal conductivity, in units mW m^-1 K^-1

In Table 1, the first line of identical temperatures is the bubble-point pressure, i.e., the pressure at which boiling begins as the pressure of the liquid is lowered; the second line is the dew-point pressure, i.e., the pressure at which condensation begins as the pressure of the gas is raised.

Table 2 gives the properties of air along various isobars. An entry with non-integer temperatures in the isobar section indicates a phase transition (liquid–vapor) at these temperatures; property values are then given for both phases. These are identified by the high densities in the liquid and the low densities in the vapor. Additional calculations at state points not listed below can be obtained by using the NIST program REFPROP <http://www.nist.gov/srd/nist23.cfm>.

In the range from the solidification point to 873 K at pressures to 70 MPa, the estimated uncertainty of density values calculated with the equation of state is 0.1%. The estimated uncertainty of calculated speed-of-sound values is 0.2%, and that for calculated heat capacities is 1%. At temperatures above 873 K and 70 MPa, the estimated uncertainty of calculated density values is 0.5%, increasing to 1.0% at 2000 K and 2000 MPa.

References

Lemmon, E.W., Jacobsen, R.T, Penoncello, S.G., and Friend, D.G., Thermodynamic Properties of Air and Mixtures of Nitrogen, Argon, and Oxygen from 60 to 2000 K at Pressures to 2000 MPa, J. Phys. Chem. Ref. Data, 29, 331, 2000. [https://doi.org/10.1063/1.1285884]
Lemmon, E. W. and Jacobsen, R. T, Viscosity and Thermal Conductivity Equations for Nitrogen, Oxygen, Argon, and Air, Int. J. Thermophys., 25, 21, 2004. [https://doi.org/10.1023/B:IJOT.0000022327.04529.f3]
Lemmon, E.W., Huber, M.L., and McLinden, M.O., NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 9.0, National Institute of Standards and Technology, Standard Reference Data Program, Gaithersburg, MD, 2010. <http://www.nist.gov/srd/nist23.cfm>

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TABLE 1. Thermophysical Properties of Air along the Boiling and Condensation Curves

Substance	T/ K	P/ MPa	ρ/ kg m^–3	H/ kJ kg^–1	S/ kJ kg^–1 K^–1	C_v/ kJ kg^–1 K^–1	C_p/ kJ kg^–1 K^–1	u/ m s^–1	η/ µPa s	λ/ mW m^–1 K^–1
Continued on next page...
Air	59.75	0.005265	957.6	-36.66	-0.5306	1.174	1.901	1030	376.6	171.4
Air	59.75	0.002432	0.1421	185.5	3.340	0.7184	1.009	154.8	4.220	5.294
Air	60	0.005546	956.5	-36.19	-0.5226	1.173	1.901	1028	371.9	171.0
Air	60	0.002584	0.1504	185.8	3.326	0.7186	1.009	155.1	4.238	5.320
Air	62	0.008270	948.2	-32.38	-0.4603	1.157	1.901	1012	336.9	167.8
Air	62	0.004111	0.2318	187.7	3.225	0.7198	1.012	157.6	4.386	5.529
Air	64	0.01200	939.9	-28.58	-0.3999	1.143	1.902	995.8	306.3	164.5
Air	64	0.006325	0.3460	189.6	3.132	0.7212	1.015	160.0	4.532	5.739
Air	66	0.01699	931.5	-24.77	-0.3414	1.129	1.903	979.1	279.4	161.3
Air	66	0.009442	0.5018	191.5	3.047	0.7230	1.019	162.3	4.679	5.950
Air	68	0.02352	923.0	-20.95	-0.2846	1.115	1.906	962.2	255.7	158.0
Air	68	0.01371	0.7089	193.4	2.968	0.7252	1.024	164.5	4.825	6.162
Air	70	0.03191	914.4	-17.13	-0.2293	1.102	1.908	945.1	234.8	154.7
Air	70	0.01943	0.9785	195.2	2.896	0.7277	1.030	166.7	4.970	6.376
Air	72	0.04250	905.7	-13.31	-0.1756	1.090	1.912	927.7	216.3	151.4
Air	72	0.02692	1.322	197.0	2.828	0.7305	1.037	168.7	5.115	6.592
Air	74	0.05566	897.0	-9.468	-0.1232	1.078	1.917	910.0	199.9	148.1
Air	74	0.03655	1.753	198.7	2.766	0.7338	1.046	170.6	5.260	6.810
Air	76	0.07179	888.1	-5.617	-0.07209	1.067	1.923	892.1	185.2	144.8

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THERMOPHYSICAL PROPERTIES OF AIR

References

TABLE 1. Thermophysical Properties of Air along the Boiling and Condensation Curves

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