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I'm studying now phase transitions. I saw that the order parameter of water gas-liquid transition is the d[g]-d[c] or d[l]-d[c].

where

d[g] is gas density

d[l] is liquid density

d[c] is the critical density

Can someone please elaborate more about the critical density?

what is it?

how can it be a factor between both transitions from liquid-gas and gas-liquid, I mean is it the same for both transitions?

if yes, then how can both become zero in the phase transition on each side of the critical temperature? and is there some theoretical way to calculate the critical density?

Thank you :)

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# Critical density of water - phase transitions

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