Quote:
Originally Posted by orestis
Though i thought Sublimation is when carbon dioxide skips the liquid state and freezes to form what is commonly referred to as dry ice (no?).So when it melts it doesn't turn into liquid but turns straight into a gas(right?)
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Sublimation is the process when a substance transitions directly from a solid state into a gaseous one.
Deposition (or Precipitation) is the reverse of that process.
As for the state of various compounds on Mars, at 6millibars, CO2 can not exist in a liquid form on the surface of Mars.
Water should be able to exist on the day lit side if the atmospheric pressure rises above 0.006atm, requiring only temperature of greater than 0C for liquid water to be stable.
Quote:
Originally Posted by CraigS
In a way, the atmosphere should be an indirect indicator of the proportions.
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I'm not sure I agree with this statement, as the composition of the atmosphere is directly related to the partial pressures of each component at Mars' atmospheric conditions. Reviewing the enclosed phase diagrams should give insight as to why taking the proportion or ratios of gases in any atmosphere is not directly related to the ratio of the compounds in the overall system. However, knowing the phase behavior of each and the conditions, we can back calculate (or estimate) the proportion of each in a static (adiabatic) system (which I guess could be described as ''indirect''
).
OIC!