FS#291 How to deal with solutes?
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There are different ways to deal with solutes and their influence on the phase properties.
1) we know it
2) linear mixture (based on moles, e.g. density for ideal gases)
3) assumed linear mixture (based on moles/masses)
4) neglected influence of the minor component
Sometimes we assume case 2) even though we consider the components not to be ideal (e.g. density() in h2oairfluidsystem).
For some fluidsystems (e.g. h2oairfluidsystem) we mix case 3) and 4) without any reasoning -> thermalConductivity (gas -> dry air -> case 4) but heatCapacity (mixed -> case 3).
Should/Could we discuss how to proceed if 1) and 2) is not true?
Does it make sense to agree on default treatment (e.g. always linear mixture (molar/mass based) or neglecting for liquid and linear mixing for gas)? Or do we allow to mix solutions, formulations in whatever way the author thinks is correct?