Atmospheric Pressure
Atmospheric Pressure is based on the amount, mass, and type of gas filling a space at a time.
If two gases interact, the gas with the most pressure will force the other gas out of its area (mostly seen between 
Oxygen and 
Carbon Dioxide).
Effects
On Duplicants
The Breathability of Oxygen and 
Polluted Oxygen is dependant on the the Atmospheric Pressure.
| Atmospheric Pressure | Breathability | Effects |
|---|---|---|
| above 1 kg | Very breathable | |
| 525 g to 1 kg | Breathable | |
| 50 g to 525 g | Barely Breathable | Duplicants will get the +10% Stress/Cycle due to Low Oxygen for the duration they remain in a Low Oxygen environment. |
| below 50 g | Unbreathable | Duplicants will hold their breath, but will not suffer from a Low Oxygen debuff |
Additionally, if the Atmospheric Pressure of any Gas a Duplicant is inside is above 4 kg, Duplicants will get Popped Eardrums, a +20% Stress/cycle debuff that lasts for half a cycle.
On Plants
Most Plants can only grow if enough, but not too much Atmospheric Pressure is present. This is most often the range from 150 g to 10 kg, but Nosh Sprout, Dasha Saltvine, and Oxyfern go as low as 10g, and Waterweed can be submerged in up to 950 kg of liquid. Single use consumable plants, such as Muckroot don't need any specific Atmospheric Pressure, and neither do Wheezewort, Thimble Reed, nor Jumping Joya.
On Machinery
Machines whose main purpose is to generate gasses such as the Electrolyzer and Oxygen Diffuser will stop running and give an overpressure warning at 1.8kg. While a Petroleum Generator which produces Carbon Dioxide as a side product, does not.
On Geysers
Geysers, Vents, and Volcanoes also can be forced to stop erupting once they are over-pressured.
- 150 kg overpressure Volcanoes, Minor Volcanoes and Metal Volcanoes
- 500 kg overpressure Water Geysers/Vents (Polluted, Cool Slush, Salt, and Cool Salt Slush)
- 5kg overpressure Gas Vents (Carbon Dioxide, Hydrogen, Hot Polluted Oxygen and Infectious Polluted Oxygen, Chlorine, and Natural Gas)
On Emitting Elements
Offgassing Elements such as Oxylite or Polluted Water will stop producing emitting their respective element at 1,800 grams Atmospheric Pressure.
