Gas Mixture Properties

Special care must be taken for gas mixtures when using the ideal gas law, calculating the mass, the individual gas constant or the density

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A mixture of gases is common for many applications. Our most daily example is air - mainly consisting of nitrogen, oxygen and water vapor - moist air. Combustion gas, mainly with nitrogen, water vapor and carbon dioxide, is an other example.

Special care must be taken for gas mixtures when using the ideal gas law, calculating the mass, the individual gas constant or the density.

The Ideal Gas Law for a Gas Mixture

The Ideal Gas Law for a perfect or ideal gas adapted for a gas mixture:

pV = mmGmT (1)

where

p = absolute pressure in the mixture (N/m2, lb/ft2)

V = volume of the mixture(m3, ft3)

mm = mass of the mixture (kg, lb)

G = the individual gas constant for the mixture (J/kg.K, ft.lb/slugs.oR)

T = absolute temperature in the mixture (oK, oR)

The Mass of the Gas Mixture

The mass of the mixture can be expresses as:

mm = m1 + m2 +..+ mn (2)

where

m1 + m2 +..+ mn = the mass of each gas component in the mixture

The Individual Gas Constant of the Gas Mixture

The individual gas constant for the gas mixture can be expressed as:

Gm = (G1m1+ G2m2 +..+ Gnmn) / (m1 + m2 +..+ mn ) (3)

The Density of the Gas Mixture

The density of a gas mixture can be calculated as:

ρm = (ρ1v1 + ρ2v2 + .. + ρnvn)/(v1 + v2 + .. + vn ) (4)

where

ρm = density of the gas mixture (kg/m3, lb/ft3)

ρ1 .. ρn = density of each of the components (kg/m3, lb/ft3)

v1 + v2 + .. + vn = volume share of each of the components (m3, ft3)

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Related Topics

  • Fluid Mechanics The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.
  • Gas and Compressed Air Gas properties, capacities of pipelines, sizing of relief valves - air, LNG, LPG and more

Related Documents

  • Ideal Gas Law In perfect or ideal gas the change in density is directly related to the change of temperature and pressure as expressed by the Ideal Gas Law
  • The Individual and Universal Gas Constant The Individual and Universal Gas Constant in fluid mechanics and thermodynamics

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