Partial Pressure - Partial Volume (Amagat's Law of Additive Volume)

Partial Volume (Amagat's Law of Additive Volume)

The partial volume of a particular gas is the volume which the gas would have if it alone occupied the volume, with unchanged pressure and temperature, and is useful in gas mixtures, e.g. air, to focus on one particular gas component, e.g. oxygen.

It can be approximated both from partial pressure and molar fraction:

  • Vx is the partial volume of any individual gas component (X)
  • Vtot is the total volume in gas mixture
  • px is the partial pressure of gas X
  • ptot is the total pressure of gas mixture
  • nx is the amount of substance of a gas (X)
  • ntot is the total amount of substance in gas mixture

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