Air
From Unofficial Stationeers Wiki
Description
Air is primarily used to create breathable, pressurized rooms that eliminate the need for EVA suits for humans. It is, however, ill-fitted for use in an EVA suit's oxygen supply, as the nitrogen will not be filtered out of the helmet, which, over time, lowers oxygen concentration in the helmet to unbreathable concentrations. When filling tanks in a nitrox environment, it is advised to use nitrogen filters alongside carbon dioxide filters in the EVA suit to keep the oxygen concentration high in the helmet.
Breathable atmosphere
For a human player, in order to open the helmet safely, a room atmosphere with at least 16kPa O2 partial pressure is required (will get lung warning but no damage). A partial pressure > 21kPa O2 is both safe and does not generate lungrelated warnings.
The presence of other inert gasses (nitrogen, carbon dioxide, water) is allowed and not harmful for breathing. It mis advisable to add other gasses, to allow plant growth,to increase heat capacity or reduce the risk of ignition.
The presence of some other gas fractions (pollutants, nitrous oxide, volatiles) is harmful for the human player. It will result in warnings in low quantities and damage or loss of consciousness when present in larger quantities.
Sources
Default air is defined in game as a mixture of 75% nitrogen to 25% oxygen.
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