Temperature ChartĮxample - Mass of Air at Temperature 100 oCįrom the table above - the density of air is 0.946 kg/m 3 at 100 oC. The triple point of a substance is the temperature and pressure at which the three phases (gas, liquid, and solid) of that substance coexist in thermodynamic equilibrium.ĭownload and print Air - Density vs. The curve between the triple point and the critical point shows the air boiling point with changes in pressure.Īt the critical point there is no change of state when pressure is increased or if heat is added. The phase diagram for air shows the phase behavior with changes in temperature and pressure. However, at low temperature and high pressures the gas mixture becomes a liquid. See also more about atmospheric pressure, and STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure,Īs well as Thermophysical properties of: Acetone, Acetylene, Ammonia, Argon, Benzene, Butane, Carbon dioxide, Carbon monoxide, Ethane, Ethanol, Ethylene, Helium, Hydrogen, Hydrogen sulfide, Methane, Methanol, Nitrogen, Oxygen, Pentane, Propane, Toluene, Water and Heavy water, D 2O.Īir is a mixture of gases at standard conditions. Specific heat (heat capacity) at varying temperature.Specific heat (heat capacity) at varying pressure.Properties at gas-liquid equilibrium condition.Diffusion coefficients of gases in excess of air. Density, specific weight and thermal expansion coefficient at varying temperature.Viscosity, kinematic, at 0☌ and 1 bara: 0.00001349 m 2/s = 13.49 cSt = 0.0001452 ft 2/sįollow the links below to get values for the listed properties of air at varying pressure and temperature:.Specific heat capacity (C v) air at 0☌ and 1 bara: 0.7171 kJ/kgK = 0.17128 Btu(IT)/(lb m ☏) or kcal/(kg K).Specific heat capacity (C p) air at 0☌ and 1 bara: 1.006 kJ/kgK = 0.24028 Btu(IT)/(lb m ☏) or kcal/(kg K).Liquid density at boiling point and 1 bar: 875.50 kg/m 3 = 54.656 lb/ft 3.Bulk modulus elasticity: 1.01325 x 10 5 Pa or N/m 2.Enthalpy and Entropy Departure Functions for Gases. The screencast video at explains how to use this Demonstration. Where, ,, ,, and are constants used for simplification. These equations are used to calculate the compressibility factor : Where and are constants, is the reduced pressure (dimensionless, not to be confused with ), and is the critical pressure (MPa). Where is the compressibility factor, is the reduced temperature (dimensionless, not to be confused with ), is the critical temperature (K), is the acentric factor, and and are constants. Where, ,, and are heat capacity constants ( ), is temperature (K), and is pressure (MPa). Where is in kJ/mol and is in kJ/ the superscript represents an ideal gas, the subscript refers to the reference state, and and are the enthalpy and entropy departure functions for a real gas calculated from the Peng–Robinson EOS, while and are the ideal gas enthalpy and entropy at the reference state. Enthalpy and entropy are calculated using the Peng–Robinson equation of state (EOS) for a real gas and the ideal gas law for an ideal gas:
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