In Total Recall, Arnolds character is exposed to the Martian atmosphere without a spacesuit and recovers. It seems unlikely that anyone could survive, not even Arnold. How long could an unprotected human be exposed to the Martian atmosphere and still live? If it is possible that a person could survive, how would the exposure affect them physicaly?
Mars has a maximum of .011 of Earth's atmospheric pressure at its the bottom of its deepest depth. But the Armstrong limit, the pressure where water boils at the normal temperature of the human body, is only 0.0618 atmosphere. It is possible that the blood itself would not boil immediately: but all saliva, tears, skin moisture and most importantly the water in the alveoli of the lungs would boil away, which would cause death within a few minutes.
Also, the oxygen fraction is only 0.13% so there is nothing useful to breathe even if you could manage to. So while you were dying of evaporation you would die of suffocation.
Finally, the average annual temperature is −63 °C/−82 °F. Honestly though, this is survivable unprotected for longer than the atmosphere is and won't kill you that quickly.
However - yes, a human probably could survive for 1 or 2 minutes, tops, if they had the presence of mind to
hold their breath and close their mouth and eyes and not panic. [EDIT: Holding your breath is not a good idea during decompression, it seems]. But they'd be in very bad shape.
Mars is not a total vacuum, but at 1% of Earth's atmosphere, is close enough as far as human survival is concerned.
Geoffrey Landis has a good discussion of human vacuum exposure at his site.
Short answer: 10 seconds of "useful consciousness", another 10-20 seconds of pain before passing out, but as much as a minute beyond that before permanent damage happens.
Other than the eyes popping out, that scene was relatively plausible.
Also, despite what Mark Beadles says, you don't want to hold your breath. Trying to keep pressure in your lungs will destroy them.
For the face, it's as if you block your nose and close mouth and blow out with 1-4 kilos of force, i think it's just past the limit of outward pressure of what a human can seal in. for all i know it could be like a CO2 canister blowing up in your mouth!
You couldnt hold your breath on mars for very long. the pressure differential is about 1/100, 1m of water is about 1 atm, so it's like plunging to 100 meters too fast. the air in your lungs would try to expand to 100 times its normal pressure, saved only by your lips and nose. that's not humanly sustainable.
Also your ears and sinuses would pop, if they werent decompressed. they would have 100 times pressure! gas in belly would probably not be directly pressures as belly is a strong barrier. it depends how strong your bum is, but your belly would be sucked in every direction with 0.011 atmo's pressure, it's -100 kilos per square meter sucking force? so 100grams per square centimeter
would it be like putting vaccuum cleaners on your eyes? well it would be like a sink plunger with 1 pound weight hanging off each eye, 1-3kilos pulling out your lips and cheeks, and 25 or 50 kilos sucking your ribcage and neck at 360 degrees.
you'd struggle to hold the air in! you should bandage all your head up and maybe you would get just bad eye and ear strain for a few seconds? you would have to block your nose against 200grams of sucking force also.
I would think that ideally you would want to exhale a good amount of air, but retain enough in your lungs to create the most positive pressure you could safely hold. Like the pressure when you take the deepest breath and then hold it. I would also think closing your eyes tightly and pinching your nose too, for maximum longevity!