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Pressure to freeze ice

  1. Feb 27, 2015 #1
    1. The problem statement, all variables and given/known data
    **This thread could also belong to the chemistry forum**
    *This isn't an actual homework problem, but it is a simple question, so I put it here in the homework forum. I am under the impression that the physics forum is for more advanced questions*
    How deep would an ocean on earth have to be for ice VII to form? It forms under 3 GPa of pressure at room temperature (20 C).

    2. Relevant equations

    3. The attempt at a solution
    I am only asking this question because I am curious how the Mariana Trench compares. At the bottom of the Mariana Trench, the pressure is 110 MPa. ## \frac {3} {t} = \frac{3GPa}{110MPa} ## = 27.27. So the Mariana Trench needs to be 27 times deeper. Is this correct (if the temperature is assumed to be a constant ?
  2. jcsd
  3. Feb 27, 2015 #2


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    Give or take corrections for compressibility of sea water, looks good enough. Depth of Mariana Trench isn't a particularly standard unit of length, so you might consider turning that into meters or kilometers, but that's nitpicking.
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