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Fun fact: if you wanted to keep an open-air swimming pool on the surface of Mars, you'd have to keep it heated at a temperature exactly between 0°C and 0.5°C (about 32°F). Because the atmospheric pressure on Mars is so low, water would boil if its temperature got any higher.
And any lower than that, it would freeze (which would be the default given that the surrounding atmosphere would be at around -60°C / -80°F)
Now, fun medical puzzle: if you took off your spacesuit on the surface of Mars, what would immediately happen to you? Would you...
I'm sure the folks who made The Martian had to figure this one out
Salt water pool perhaps?
Would it start boiling, but also get colder and freeze eventually? I'm having a hard time figuring the full cycle until it's stable.
Very likely you never get to see water (you only have ice -> vapor transitions) if you trust the atmospheric pressures reported for mars in wikipedia. To see water, you might have to increase the pressure in the martian sauna!
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