Posted by **Sean** on Monday, March 30, 2009 at 8:00pm.

When a sample is above critical temperature and above critical pressure, it is a supercritical fluid.

What happens when a sample is above critical temperature but below critical pressure? What phase is that?

What happens when a sample is above critical pressure but below critical temperature? What phase is that?

"Discuss what would be observed as a sample of water is taken along a path that encircles and is close to its critical point."

Obviously, when a sample crosses the gas-liquid phase boundary, standard evaporation or condensation will occur. But how about the rest of that cycle?

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