![]() ![]() Carbon monoxide - CO - 0 to trace (ppm)Ĭommon Pressure Units frequently used as alternative to " one Atmosphere".Iodine - I 2 - 0.01 parts/million (ppm).Nitrogen dioxide - NO 2 - 0.02 parts/million (ppm).Ozone - O 3 - 0 to 0.07 parts/million (ppm).Nitrous oxide - N 2O - 0.5 parts/million (ppm).Sulfur dioxide - SO 2 - 1.0 parts/million (ppm)."One Standard Atmosphere" is defined as the pressure equivalent to that exerted by a 760 mm column of mercury at 0 oC sea level and at standard gravity ( 32.174 ft/sec 2).The average air temperature diminishes at the rate of 0.6 oC for each 100 m vertical height.The composition of air is unchanged until elevation of approximately 10.000 m. ![]() The maximum moisture carrying capacity of air depends primarily on temperature The water or vapor content in air varies.See also Air Density at varying pressure, Density and specific weight at varying temperature, Diffusion Coefficients for Gases in Air, Dynamic (absolute) and kinematic viscosity, Prandtl Number, Specific heat at varying temperature and Specific heat at varying pressure, Thermal Conductivity, Thermal Diffusivity, Properties at gas-liquid equilibrium conditions and Air properties, for other properties of airĪir is usually modeled as a uniform (no variation or fluctuation) gas with properties averaged from the individual components.įor full table - rotate the screen! Components in dry airġ) A ccording NASA CO 2 level in 1960 aprox. Composition and content of each gas in air is given in the figures and the table below. The molar mass of dry air is 28.9647 g/mol. The average molar mass is equal to the sum of the mole fractions of each gas multiplied by the molar mass of that particular gas: Since both of these elements are diatomic in air - O 2 and N 2, the molar mass of oxygen gas is 32 g/mol and the molar mass of nitrogen gas is 28 g/mol. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol. Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen. ![]()
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