The 6th row of Monitor Sheet shows Potential information.
Definite: Each element's (component's) chemical potential is definite.
Indefinite: Each element's (component's) chemical potential is indefinite, or
Projected Gradient > 1.
If each element's chemical potential is definite as
L1,L2,…,Ln,
then A:the activity of a compound is derived from
μ0 + RTln(A) =
a1L1
+a2L2+
…
+anLn
Here,
μ0 : Chemical potential of the compound at the Temperature and 1atm.
aj : Stoichiometry coefficient of the compound for element j.
For gaseous compound, this activity expresses partial pressure (calculation is based on ideal gas) of the gas. Note that even if all gaseous compounds result in 0 mol in the calculation, non-zero value of activity will be showed for each gas if potential is definite. This means vapor pressure. You will know that the gases could not appear because the sum of their activities does not reach the outer pressure.
For condensed compound, the activity is 1 if it appears. The closer to 1 the activity is, the more likely the compound appears when temperature or pressure/volume changes.
If the potential is indefinite, the value of activities are simply calculated as partial pressure for gaseous compounds. For condensed compound, '----' will be showed but it is also true that the activity of deposited compound is 1.
Whether potential is definite or indefinite depends on a set of compounds finally exists. This theme requires the details of algorithm, and is beyond this help.
Also you can see the Potential information in the 2nd row of Activities Sheet by clicking the leftist column of the row.