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Any species with a name ending with
The fugacity for a gas is equivalent to the activity for an aqueous species.
logK°-value: for an equilibrium between a gas phase and an
aqueous solution, it must be assumed either
For constant pressure:
P is in units of bar. In the Earth’s atmosphere
For constant volume:
where the concentrations are given in
Using the eqn. for perfect gases
The factor 0.01 is needed to convert the units
Important: DATABASE and SPANA are based on
During the calculations to make a diagram, the concentration of a gas is not evaluated. The fugacity is calculated and displayed in log activity diagrams.
Example of a redox gas reaction:
line in database: