×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Freezing point water under pressure.

Freezing point water under pressure.

Freezing point water under pressure.

(OP)
I was just wondering...

What is the freezing point of water is at e.g. 2 bar?
Is there a lineair scale between pressure and temperature?

RE: Freezing point water under pressure.

(OP)
Thank you.

p.s. I did make a google search. English isn't my natural language, hence I didn't find the right answer.

RE: Freezing point water under pressure.

Sometimes askers want expert opinions after looking up stuff.

RE: Freezing point water under pressure.

Wikipedia is only as good as the last person who edited it.

rmw

RE: Freezing point water under pressure.

I don't think it freezing point changes with pressure.

If you stick a tank of water outside (Northern Canada), one open to atmosphere and one under your indicated pressure, both would freeze due to thermal losses.  At two bar, the temperature difference is probably neglegible.  You may wish to use a chemistry book or thermodynamic reference just to be sure, and post your search results to this forum.

I do know that freezing temperature does change with fluid flow, i.e. rivers freeze much later than lakes or still bodies.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

RE: Freezing point water under pressure.

At 2 bar g the freezing point is -0.01234 deg C which would not be noticeable with normal instrumentation.  You have to get the pressure up to 135 bar g to reduce the freezing point by 1 deg C.  I doubt whether the relationship is linear.

Katmar Software
Engineering & Risk Analysis Software
http://katmarsoftware.com

RE: Freezing point water under pressure.

The effect is small but real and you can see it in the curve in the wikipedia reference. The classic demonstration is that a loop of string around a block of ice that is tensioned by a hanging weight will cut through the ice. The ice under the the string melts due to pressure and then refreezes above the string where there is no pressure. Thank you Mr. Wizard.

RE: Freezing point water under pressure.

To add to Compositepro discussion of the classic demonstration is the explanation of the physics involved in ice-skating.  Properly sharpened ice skates glide on a water film due to pressure.  I remember that explanation from somewhere in school.    

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources