What temperature F does water freeze at 65 PSI ?

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Discussion Overview

The discussion centers around the freezing point of water at a pressure of 65 PSI, exploring how pressure affects the freezing temperature. Participants express frustration with existing resources and seek a formula or explanation for the phenomenon. The conversation includes references to phase diagrams and empirical observations related to freezing under pressure.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant states that water freezes at 32°F under normal atmospheric pressure and questions how pressure affects this freezing point.
  • Another participant suggests that at 65 PSI, water will freeze at a temperature slightly lower than 32°F, possibly around 31°F, but does not provide a definitive answer.
  • A later reply mentions that the change in melting point with pressure is weak, indicating that the freezing point remains close to 32°F, with corrections being only a few hundredths of a degree.
  • Participants share links to phase diagrams and empirical formulas related to freezing points under pressure, although one participant expresses difficulty in finding specific information about the exact freezing temperature under the stated pressure.
  • One participant recalls a TV show discussing winterizing a house, noting that water under pressure is less likely to freeze, which adds anecdotal context to the discussion.
  • Another participant shares an observation about supercooling soft drinks, noting that they can freeze instantly upon opening, which raises questions about the behavior of water under varying conditions.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the exact freezing temperature of water at 65 PSI, with multiple competing views and observations presented. The discussion remains unresolved regarding the precise effects of pressure on the freezing point.

Contextual Notes

Some statements made by participants contain ambiguities or inaccuracies, and the discussion reflects a range of assumptions about the relationship between pressure and freezing point. The empirical formulas and phase diagrams referenced may not provide a direct answer to the specific question posed.

gary350
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What temperature F does water freeze at 65 PSI ?

I looked this up online but all I find is stuff I already know and lots of advertisements. It makes me mad to clink on a link that forces me to look at an advertisement and when I try to click to leave it will NOT let me leave. All I have learned so far is what I already know, water freezes at 32 deg F, highest density is 39 deg F, only substance know that can exist in all 3 states, gas, liquid, solid. A soft drink will freeze at 29 deg F. Water freezes at 2 bars. Water boils at 70 deg F in a vacuum. Flowing water will not freeze at 32. SO WHAT!

What I need to know is how does pressure effect the freezing point of water. There has to be a formula to calculate this?

Water pressure in my house is 65 PSI at what temperature F will water in the pipes freeze?
 
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only substance know that can exist in all 3 states, gas, liquid, solid.
Here is a site with the pressure/temperature phase diagrams of carbon dioxide, helium and water.
http://www.chem.queensu.ca/people/faculty/mombourquette/Chem221/5_PhaseChanges/PhaseDiagrams.asp

You will notice that all three have what is called a triple point, which is where all three phases ( gas, liquid, solid ) co-exist. Other substances behave similarly. Your statement is not accurate at all.

Water pressure in my house is 65 PSI at what temperature F will water in the pipes freeze?
A litle bit lower than 32 degrees F, but not much. Probably not even 31 degrees F.
 


gary350 said:
I looked this up online but all I find is stuff I already know and lots of advertisements. It makes me mad to clink on a link that forces me to look at an advertisement and when I try to click to leave it will NOT let me leave. All I have learned so far is what I already know, water freezes at 32 deg F, highest density is 39 deg F, only substance know that can exist in all 3 states, gas, liquid, solid. A soft drink will freeze at 29 deg F. Water freezes at 2 bars. Water boils at 70 deg F in a vacuum. Flowing water will not freeze at 32. SO WHAT!

What I need to know is how does pressure effect the freezing point of water. There has to be a formula to calculate this?

Water pressure in my house is 65 PSI at what temperature F will water in the pipes freeze?
Some of the things that you found/know are not quite right or are somehow ambiguous. So is hard to answer the "SO WHAT!".

The change in melting point with pressure is very weak. For the pressure you are interested (65 psi) the answer in first approximation will be 0 Celsius (or 32 F). The correction due to the increased pressure (about 4 atm) is of the order of a few hundredths of degree.
Phase diagrams are available in many places, for example here:
http://www.lsbu.ac.uk/water/phase.html

An empiric formula is for example here:
http://en.allexperts.com/q/Physics-1358/2009/1/freeze-point-water-under.htm
 
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I have been out of college too long 40 years, I have forgotten more than I ever knew. I clicked the links but I don't see anything about the exact temperature water will freeze under pressure.

There was a TV show a few days ago the guy was talking about winterizing a house. He said turn the heat down low but leave the water on because water under pressure is less likely to freeze.

If I put a soft drink in the freezer for about 1 hour then remove it, it is not frozen but when I open the bottle it will instantly freeze solid.

I remember in college class we put a glass of room temperature water in a vacuum and it boiled. I don't know what the exact temperature the tap water was.
 
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