Delightful Life
M&M, Cascadian Lovers
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I didn't even know that water could exist within those temperatures.....I thought it would evaporate, whether embedded in rocks or not.
Pretty cool, eh?
Here is a chart detailing the info we shmart nosepokey primates have dicovered aboot water. The horizontal axis is tempearature -- the vertical axis is pressure -- higher pressure can mean deeper into the earth or even atmospheric pressure
(source google image search)
You'll note there are two data points that are 'Freezing point at 1 atm' and 'Boiling point at 1 atm' -- these are the ones that we are taught -- 0 C and 100 C
You'll also notice some other things, like 'Critical Point', which is the temperature and pressure that the boundaries between liquid & gas states do not exist. The 'Triple Point' is the temperature and pressure where all 3 phases (solid liquid & gas) exist. And a solid, liquid, and a gas all exhibit different behaviours.
Now roughly, pressure increases by 30 kPa per km of depth. So 700km = 21000 kPa -- cross index that with the temperature at that depth ~1625 c...water may actually be a solid? :3
For fun, here is a list of pressures and their real world equivalents https://en.wikipedia.org/wiki/Orders_of_magnitude_(pressure)