1 Scope
This document defines the following quantities commonly used to express the composition
of gas mixtures:
-
— amount fraction and concentration;
-
— mass fraction and concentration;
-
— volume fraction and concentration.
For these quantities of composition, this document specifies methods for:
-
— conversion between different quantities;
-
— 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, volume concentrations can only be used if the component under consideration is completely gaseous, and
for the use of volume fractions, all components need to be completely gaseous. Further restrictions of state conditions
apply for approximations of compression factors using virial coefficients (see Annex A).