scope:

This document defines the following quantities commonly used to express the composition of gas mixtures:

- amount fraction,

- mass fraction,

- volume fraction,

and

- amount concentration,

- mass concentration,

- volume concentration.

For these quantities of composition, this Document provides methods for

- conversion between different quantities, and

- conversion between different state conditions.

Conversion between different quantities means calculating the value of the content of a specified component in terms of one of the quantities listed above from the value of the same content, at the same pressure and temperature of the gas mixture, given in terms of another of these quantities. Conversion between different state conditions means calculating the value of the content of a specified component, in terms of one of the quantities listed above, under one set of state conditions from the value of the same quantity under another set of state conditions, i.e. pressure and temperature, of the gas mixture. Gas mixture composition can be converted simultaneously between different quantities of composition and different state conditions by combination of the two types of conversion.

This document is applicable only to homogeneous and stable gas mixtures. Therefore any state conditions (pressure and temperature) considered need to be well outside the condensation region of the gas mixture. In addition, the use of volume concentrations requires that the component under consideration is completely gaseous, and for the use of volume fractions even all components shall be completely gaseous. Further restrictions of state conditions apply for approximations of compression factors using virial coefficients (see Annex A).