AIR PROPERTIES

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AIR PROPERTIES

Air properties - temperature, composition, density, specific heat, thermal conductivity, expansion coefficient, kinematic viscosity and Prandtl number for temperatures between -150^oC and 400^oC.

Common properties for air can be taken from the table below:

Temperature - t - (oC)	Density - ρ - (kg/m3)	Specific heat capacity - cp - (kJ/kg.K)	Thermal conductivity - l - (W/m.K)	Kinematic viscosity - ν - (m2/s) x 10-6	Expansion coefficient - b - (1/K) x 10-3	Prandtl's number Pr
-150	2.793	1.026	0.0116	3.08	8.21	0.76
-100	1.980	1.009	0.0160	5.95	5.82	0.74
-50	1.534	1.005	0.0204	9.55	4.51	0.725
0	1.293	1.005	0.0243	13.30	3.67	0.715
20	1.205	1.005	0.0257	15.11	3.43	0.713
40	1.127	1.005	0.0271	16.97	3.20	0.711
60	1.067	1.009	0.0285	18.90	3.00	0.709
80	1.000	1.009	0.0299	20.94	2.83	0.708
100	0.946	1.009	0.0314	23.06	2.68	0.703
120	0.898	1.013	0.0328	25.23	2.55	0.70
140	0.854	1.013	0.0343	27.55	2.43	0.695
160	0.815	1.017	0.0358	29.85	2.32	0.69
180	0.779	1.022	0.0372	32.29	2.21	0.69
200	0.746	1.026	0.0386	34.63	2.11	0.685
250	0.675	1.034	0.0421	41.17	1.91	0.68
300	0.616	1.047	0.0454	47.85	1.75	0.68
350	0.566	1.055	0.0485	55.05	1.61	0.68
400	0.524	1.068	0.0515	62.53	1.49	0.68

More about Common composition for air can be taken from the table below:

Humidity (%)	Nitrogen (N2) - mol - (%)	Oksigen (O2) - mol - (%)	H2O - mol - (%)
65	78.37	19.21	2.42
70	77.67	19.48	2.85
75	76.99	19.83	3.18
80	75.90	20.11	3.990

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