A question here, behaviour of water on Mars |
A question here, behaviour of water on Mars |
May 24 2007, 12:38 AM
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#1
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Junior Member Group: Members Posts: 58 Joined: 17-September 06 Member No.: 1150 |
A question here
There are signs that in the past there was liquid water on Mars. So lets assume thats true. Since the gravity on Mars is much lower than on Earth, so how does water (waves) behave on Mars compared to Earth? Someone did say, that waves would have been much higher but also much slower. Is this true? Does anyone have an animation where you can see a waive on Earth in comparsion to a wave on Mars? Thanks |
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Nov 15 2007, 10:41 PM
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#2
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Both theory and experiment agree that cold brine solutions could exist for some time on Mars.
(IIRC, the triple point curves will need to be determined for the the exact concentration and salt type. The triple point curve for fresh pure deionized water can only be used as a rough guide. Salt concentration, ion type, and other impurities present will mess with the graph.) And the paper does a pretty good job of demonstrating that the evaporation rate is low. From Table 1 in the article you cited, for a -20 C solution of 29.8% aqueous CaCl2 at 7 mbar, the evaporation rate on Mars is predicted to be 0.1 mm/h. For comparison, the evaporation rate of ocean water at Earth's equator is 0.2 mm/h. Source (and more than you ever wanted to know about ocean dynamics): http://ams.allenpress.com/archive/1520-044...442-1-9-841.pdf So if you had a brine solution and magically transported it to Mars. It could hang out for a while. [Quick back-of-the-envelope calculation and assuming no change in evap rate on concentration, a gobal 20 m deep brine ocean would evaporate (and redeposit as polar ice?) in 22 earth years.] As Doug mentioned, you'd need a recharge mechanism to keep the water/brine/atmosphere system going. But as long as they prepared it themselves, future astronauts could still do a quick, cold Sitz bath at the end of a long day. -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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