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Topic: Critical temperature  (Read 1411 times)

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Offline zmasterflex

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Critical temperature
« on: April 02, 2014, 11:03:27 AM »
I'm getting conflicting info regarding the "critical temperature."
Is it "where liquid doesn't exist anymore," or where "no phase boundaries exist."
Both are definitions I found on the web and both are choices as an answer. I would think that the second one is more is exact but the first one is labeled as correct.... any input would give clarity. thanks

Offline Radu

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Re: Critical temperature
« Reply #1 on: April 02, 2014, 04:05:07 PM »
At a temperature equal or greater than the critical temperature, no matter how much pressure you applied, you will never get a condensed(liquid) phase. That's the physical meaning. Mathematically, I am not sure if P-T curve simply vanishes or it abruptly approaches zero. I'd go for the first one, though.( They are made considering dP/dT=ΔrH/RT2, which cannot raise to infinity , for the function to descend steeply)
« Last Edit: April 02, 2014, 05:40:47 PM by Radu »

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