Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why water freezes at low pressure?

  1. Apr 29, 2009 #1
    water freezes instantly on very low pressure, irrespective the temp being well above zero. pls explain why? .what can be added to water so that it does not freeze at very low preesure (15mtorr)?
     
  2. jcsd
  3. Apr 29, 2009 #2

    Mapes

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    When evaporating water molecules detach from the condensed phase, they take energy with them. The remaining material cools down at the interface. So you could stir the water to maintain the temperature above freezing, or you could add something soluble (like salt) to depress the freezing temperature.
     
  4. May 1, 2009 #3
    evaporation is a coolong process . just like when you put water on your finger and wave it around in the air it feels cooler , you could put anti-freeze in it.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Why water freezes at low pressure?
  1. Water freezing? (Replies: 3)

  2. Not freezeing water (Replies: 1)

  3. Water freezing (Replies: 6)

Loading...