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What in heaven's name is the 'Water Triple Point '?

  1. Nov 23, 2011 #1
    What in heaven's name is the "'Water Triple Point"'?

    And besides all the theory behind it, could you posit an experiment to prove it?
     
  2. jcsd
  3. Nov 23, 2011 #2

    phyzguy

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    Re: What in heaven's name is the "'Water Triple Point"'?

    It is the only point in the P,T plane where all three phases of water (solid, liquid, and gas) can coexist in equilibrium.
     
  4. Nov 23, 2011 #3
    Re: What in heaven's name is the "'Water Triple Point"'?

    as for an experiment, well you would need a box of some sort with water inside, where you can carefully control the temperature and pressure, then by adjusting both to the required points, you should be able to see water go from liquid to solid to gas and back to liquid, only making slight changes in the conditions

    heres a picture that shows the conditions at the point itself
    http://www.sv.vt.edu/classes/MSE2094_NoteBook/96ClassProj/examples/trip_pt1.jpg [Broken]
     
    Last edited by a moderator: May 5, 2017
  5. Nov 24, 2011 #4

    Borek

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    Re: What in heaven's name is the "'Water Triple Point"'?

    Prove WHAT?

    Can you prove chess? Can you prove a car? Can you prove a dog?
     
  6. Nov 24, 2011 #5
    Re: What in heaven's name is the "'Water Triple Point"'?

    It is the temperature and pressure at which water is solid, liquid, and gas.

    Someone in my high school chemistry class produced this state, so I have seen it with my own eyes. Ice floating in boiling water.
     
  7. Nov 24, 2011 #6

    DaveC426913

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    Re: What in heaven's name is the "'Water Triple Point"'?

    Cool.

    Is water the only (or one of a rare breed of) substances that has a triple point?
     
  8. Nov 24, 2011 #7

    jtbell

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    Re: What in heaven's name is the "'Water Triple Point"'?

    Table of triple points (Wikipedia)

    Factoid: the triple point of water is part of the definition of the Kelvin temperature scale. It's defined as 273.16 K, exactly.
     
    Last edited: Nov 24, 2011
  9. Nov 24, 2011 #8
    Re: What in heaven's name is the "'Water Triple Point"'?

    Not at all. The Wiki article on triple point includes a list of (some) materials with their triple points.

    edit: Sorry. jtbell was faster.
     
  10. Nov 24, 2011 #9

    fluidistic

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    Re: What in heaven's name is the "'Water Triple Point"'?

    Apparently not the only one: . I'm having some laughs, I used youtube as a search engine for once, almost unbelievable.

    Edit: both jtbell and nasu have been faster.
     
    Last edited by a moderator: Sep 25, 2014
  11. Nov 24, 2011 #10
    Re: What in heaven's name is the "'Water Triple Point"'?

    Excellent demonstration of the triple point of answers
     
    Last edited by a moderator: Sep 25, 2014
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