# Water vapor at approx. 300 degrees Celsius

by fawk3s
Tags: approx, celsius, degrees, vapor, water
 P: 342 Ive heard that at somewhere around 300 degrees Celsius (cant remember the exact number), you cant liquidise it anymore. Is this fact correct? Thanks in advance, fawk3s
 PF Patron P: 1,890 You can liquidise a vapour by applying a high enough pressure but only if the vapour is at a temperature lower than its "critical temperature".If the temperature is higher than the critical temperature then applying pressure results not in a liquid but in a compressed vapour.
 P: 342 Thats what I thought. Thanks !
P: 665

## Water vapor at approx. 300 degrees Celsius

 Quote by Dadface results not in a liquid but in a compressed vapour.
This shows up the difficulty with using common terms in science - a supercritical fluid is neither liquid nor gas. (And yet it's both at the same time).

Is a liquid crystal a solid or a liquid? - Same problem.
 P: 458 I'd need to check a book of steam tables but I'm pretty sure that water can still be aliquid at a lot more then 300 Deg C
PF Patron
P: 1,890
 Quote by Jobrag I'd need to check a book of steam tables but I'm pretty sure that water can still be aliquid at a lot more then 300 Deg C
I just checked and the critical temperature of water is 374Deg C.
 P: 665 Ah, yes, the critical point is 374 degrees C. (The OP did say 'about' 300) It's surprisingly low though.
 Sci Advisor P: 2,408 I'm pretty sure what OP heard is a mention of critical point. Sounds like it. Past these 374°C, there is no phase transition from vapor to liquid, and that might come out as "can't liquidise" to someone who didn't quite get the point.

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