text: Ideally the ratio of partial pressures equals the ratio of the number of molecules. That is, the mole fraction  of an individual gas component in an ideal gas mixture can be expressed in terms of the component's partial pressure or the moles of the component:
  and the partial pressure of an individual gas component in an ideal gas can be obtained using this expression:
  The mole fraction of a gas component in a gas mixture is equal to the volumetric fraction of that component in a gas mixture.
  The ratio of partial pressures relies on the following isotherm relation:
  * V is the partial volume of any individual gas component (X)
  * V is the total volume of the gas mixture
  * p is the partial pressure of gas X
  * p is the total pressure of the gas mixture 
  * n is the amount of substance of gas (X)
  * n is the total amount of substance in gas mixture