Quote:
Originally Posted by Tim Thompson
...And because the atmosphere of Mars is only about 1/1000 of the density of Earth's atmosphere, it could hold very little water vapor anyway, even if it were warm enough. Since there is no way to get water vapor to hang around in the atmosphere so it can condense into liquid, there is no way to get rain on Mars.
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Oops, Bad Meteorology alert!
Air does not "hold" water vapor. Gas pressures (including water vapor pressure) are independent of other gases. This is true for water vapor whether on earth or mars.: The low water vapor pressure on mars is not caused or limited by low atmospheric pressure - but by limited water and temperatures.
http://www.ems.psu.edu/~fraser/Bad/BadClouds.html
http://fermi.jhuapl.edu/people/babin/vapor/index.html