Water vapor at approx. 300 degrees Celsius

  • Thread starter fawk3s
  • Start date
  • #1
342
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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
 

Answers and Replies

  • #2
2,479
99
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.
 
  • #3
342
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Thats what I thought. Thanks !
 
  • #4
668
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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.
 
  • #5
549
28
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
 
  • #6
2,479
99
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.
 
  • #7
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Ah, yes, the critical point is 374 degrees C. (The OP did say 'about' 300)
It's surprisingly low though.
 
  • #8
K^2
Science Advisor
2,469
29
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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