# How to classify your fluid is a transitioning from a liquid to gas from numerical computation

I saw at one time that if the kinetic energy/potential energy of the gas was approaching 1 then the gas is becoming a liquid. I can't find the reference where I found that though (it was on stack overflow).

I guess in general I'm interested if you can track from solving the NSE numerically when you are transitioning from a gas phase to liquid?

This is very interesting approach. The ratio of Kinetic energy (inertia) and Potential energy (field) is commonly named as a Froude-number. And indeed you can solve NSE numerically to get this transition. I have actually made this derivation. Basically it shows you that the limit is $$Fr=\sqrt3$$. This Q&A is related; How should energy loss in a hydraulic jump be calculated?