Handeling mass fractions in Modelica.Media: using reducedX or not?
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I have a question regarding how to handle the mass fractions of a multicomponent medium that I'm working on. To be more specific, I'm wondering whether to choose a reduced-state model (as in reducedX = true;) or a full-state model (as in reducedX = false;). 

The model is currently reduced-state, and it seems to be working as it should. To me, it seemed like a good idea to utilize the fact that sum(X) = 1. However, I found this in the documentation of the Modelica.Media-package 

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"(...) Although this kind of model (the full-state model) is heavier, as it provides one extra state variable, it can be less prone to numerical and/or symbolic problems, which can be caused by that constraint (in the reduced-state model)."


Does anyone happen to know whether these "numerical and/or symbolic problems" are something to worry about, or if there are any other reasons for not using a reduced-state model? Or any other upsides for using a full-state model, for that matter?

Any help or thoughts on the matter will be greatly appreciated!



 