>>12843236Pro tip, the amount of oxygen you burn by mass is less than the amount of food you eat because food contains water.
1kg of glucose gives 3660 calories, enough for a strenuous day of mountain climbing. To metabolize it you need 1.07 kg of Oxygen.
That is literally all the Oxygen you would consume in a day if you burned 3660 calories of glucose in that day.
Space suits carry enough oxygen for more than a day of use, but they only carry enough CO2 scrubber for about 16 hours. There are methods to make regenerative CO2 scrubbers for space suits that could make it possible to last more than a week.
Space suits are heavy because they need batteries, pressure containment, cooling systems etc. A CO2 scrubbing system and enough oxygen could be made in less mass than those two oxygen tanks next to your dead hiker.
