What is the difference between the liquid and gas species in fluid

MFiX
#1

I defined a reaction which the methane hydrate (solid) is decomposed into water and methane gas. In fluid panel, I set a constant fluid density and viscosity etc.

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I know it is not a real three phase coupling. So I am wondering what’s the difference between the liquid and gas species in fluid. Why not treat all the fluid as gas?

#2

Sorry, the question is not clear. In what way are the H2O and CH4 being handled differently in the fluid/gas phase?

#3

Yes, what’s the difference in calculation?