A couple of colleagues and I were talking about the nature of dewpoints, specifically the dewpoint of water in relation to the chemical composition of the atmosphere in a closed space.
If I remember my theory, then the chemical composition of the atmosphere should not have any impacts on the dewpoint of the water (assuming ideal gas law and that the atmosphere won't react with the water vapors)
My colleagues disagree with this, as they are of the opinion that different gasses can hold different concentrations of water vapor, e.g. $\ce{CO2}$ versus $\ce{N2}.$ As such, they argue that water would "crash out" of the gas phase at higher temperatures in atmospheres that could "hold less water".
Instead of wasting countless hours on research, I thought I might as well ask you brilliant people, if any of you could settle this dispute, or point me in a direction where an answer could be found.