Martian Hydrology |
Martian Hydrology |
Nov 23 2010, 08:46 PM
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#1
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Senior Member Group: Members Posts: 3516 Joined: 4-November 05 From: North Wales Member No.: 542 |
An interesting article from Space Daily today: http://www.marsdaily.com/reports/Shallow_G...n_Mars_999.html
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Dec 8 2010, 03:44 PM
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#2
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Member Group: Members Posts: 796 Joined: 27-February 08 From: Heart of Europe Member No.: 4057 |
Phase transitions (for example melting) of all chemical substances are dependent on pressure and temperature.
You can found phase from phase diagram. Some informations for instance here http://www.chemguide.co.uk/physical/phasee...phasediags.html or on wikipedia. Some regions on Mars (Hellas Planitia) have conditions (temperature, pressure) close to so called triple point of water, thus liquid water on Mars is theoretically possible (at least for some time in the Martian year). But amount of water vapour in Martian atmosphere is low and we haven't still accurate informations about subsurface water in equatorial regions of Mars (we need some hi-res SHARAD). " Also, as pressure increases, melting points definitely do decrease, which is what allows Lake Vostok to remain (likely) in liquid form." This isn't only because of pressure, but also heat from Earth's interior play role. Amount of interior heat in Martian case is minimal (compared to Earth). And with antifreezing substances, water can be liquid even at much lower temperature (with ammoniac and so on). -------------------- |
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