Calculation of the oxygen volume in a fixed space under negative pressure
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What is the volume fraction of oxygen in a 1 m3 space at a pressure of -600 mmHg? Please ask an expert to help! It would be great if you could provide the calculation process; I’d be very grateful!
What kind of environment is this? Is it an air environment, or a non-air environment? What is the material medium?
It’s just the air environment, with no materials. In other words: in a standard volume of 1 m3, under standard pressure and temperature, if vacuum is created, what will be the oxygen content in that space when the vacuum level reaches -600 mmHg?
It’s just the original proportion of air; there won’t be any impact
At the vacuum level mentioned by the poster, it is roughly equivalent to the atmospheric pressure at an altitude of 11,400 meters. So what is the oxygen content in the air at that altitude? Meteorology concludes that within the atmospheric layer from 0 to 90 km, due to intense vertical convection, the volume fractions of nitrogen and oxygen in the air remain essentially constant (gases that are extremely light, such as hydrogen, and gases that are extremely heavy, such as SO2, are exceptions). . As for the vacuum pump, it creates convection that is even stronger than that of \"intense vertical convection\"; the ratio of nitrogen to oxygen remains unchanged, no matter how much you pump, as the oxygen proportion always stays at 21%.
This post was last edited by qugd on 2018-7-30 at 11:43. If it is just air, then no matter what the pressure, the volume fraction of oxygen in air remains approximately 21%. (This is true in the biosphere at elevations that are not particularly high.) No calculation is needed.
The 5th floor is correct. For example, in 1 cubic unit of air, if 0.5 cubic units are removed, the remaining 0.5 cubic units are still air, and the mass fraction remains unchanged
It refers to the proportion of oxygen in normal air. You can think of it as a bottle filled with air at standard pressure; some of the air is removed by squeezing the bottle, after which it is sealed and restored to its original state. The air components inside remain the same as before, with no changes.