![]() ![]() The thermodynamic properties of air along the saturation curve are given in Table 1 these properties for the liquid and gaseous air-in Table 2. The equilibrium dissociation degree can be calculated according to the Saha equation. This implies the transition of air into the plasma state. Their equilibrium concentration can be derived from the isotherm equations of the respective reactions.Īt temperatures higher than 2000 K and moderate pressures the nitrogen and oxygen start to dissociate, and at temperatures exceeding 4000 K and atmospheric pressure the ionization of oxygen, nitrogen, and other components becomes evident. The nitrogen reacts with oxygen producing various oxides: N 2O, NO, NO 2, NO 3. The normal condensation temperature of air is -191.4☌, the normal boiling temperature -194☌.Īt elevated temperatures air undergoes some physicochemical transformations. Liquid air at atmospheric pressure behaves practically as an ideal solution following the Raoult's Law. The normal (at 0.1013 MPa) boiling (condensation) temperature of the oxygen is equal- 183☌, that of the nitrogen -195.8☌. Hydrogen is not toxic but is a simple asphyxiate by the displacement of oxygen in the air. It is flammable over a wide range of vapor/air concentrations. Density Heat c p Conductivity Diffusivity Viscosity Viscosity Number T, 8C r, kg/m3 J/kg·K k, W/m·K a, m2/s m, kg/m·s n, m2/s Pr 2 150 2.866 983 0.01171 4.8. Once ignited it burns with a pale blue, almost invisible flame. 948 PROPERTY TABLES AND CHARTS TABLE A9 Properties of air at 1 atm pressure Specific Thermal Thermal Dynamic Kinematic Prandtl Temp. ![]() Where v denotes specific volume u is specific internal energy R is the gas constant for air.Īt low temperatures the air is liquified. Hydrogen, H2, is a colorless, odorless gas.
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