Talk:Eywa

Note that xenon is a general anesthetic gas at higher concentrations. A 70% xenon 30% oxygen mix can be used as a single agent for general surgical anethesia in humans. 5% probably has little effect. However, at 0.9atm pressure, 18% CO2 has a high enough partial pressure (around 120mmHg, calculated as simple % rather than mole fraction and thus is an approximation) to produce significant CO2 narcosis, in addition to distrupting acid/base balance and causing intense air hunger in humans.

It is the hydrogen sulfide that will kill first though. 1% is 10,000ppm. Over 1000ppm hydrogen sulfide is lethal to humans in about 3 minutes. It is an active toxin (not just an asphixiant) and poisons cellular respiration similar to hydrogen cyanide. At 1% just getting oxygen back is not enough. Sully's human body would have died from his exposure at the end of Avitar. Jame Cameron should reel this in to fit the observed effects, to 500ppm or less (100ppm would be better). Or get rid of it and just rely on the high CO2 to kill humans. This would fit getting more oxygen from a simple facemask as being enough to support human life.

It also means the planet reeks of rotten eggs. Though we'd desensitize pretty quickly, making it more dangerous.