Oxygen Not Included Wiki

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Oxygen Not Included Wiki
This article contains outdated information that is inaccurate for the current version. It was last updated for LU-356355. Unreflected changes in the discussed game mechanics are detailed here: EX1-444349
This article contains outdated information that is inaccurate for the current version. It was last updated for LU-356355. Unreflected changes in the discussed game mechanics are detailed here: EX1-444349

Gases are substances that expand to fill their container.


  • Gases will condense into a liquid if cooled 3 °C under their condensation point. The same, liquids will evaporate if heated up 3 °C above their condensation point.
  • Unlike liquids, gases will always spread to nearby vacuum tiles (unless less than 1 microgram of the gas is present).
  • Elements with a lower density tend to rise above others. In the case of gases with the same density (e.g. Oxygen and Polluted Oxygen), they tend to group together and form different layers.
  • There are heat convection mechanics. The heated gasses will rise upwards, while the colder gasses will be pushed down, the gasses with similar temperatures tend to semi-randomly spread horizontally.
  • Duplicants can breathe Oxygen and Polluted Oxygen.
  • Unless specified, Critters do not breathe, and may survive in any gas as long as other conditions are met.
    • They can also survive in a vacuum.
    • Airborn Critters can fly/float in a vacuum.
  • Gases will be destroyed when exposed to space, unless protected by Drywall.
  • Gas can be stored in a Gas Reservoir.
  • Duplicants can be scalded by hot Gases like Steam. Wearing an Atmo Suit will protect them.

List of Gases[]

Gases tend to stratify (separate by height) as follows, from lightest to heaviest:

Icon  Name Description Condensation point
Condensate into SHC TC Density
Light Absortion %
Hydrogen.png Hydrogen (H) Hydrogen is the universe's most common and atomically light element in a Gaseous state. -252.15 Liquid Hydrogen 2.400 0.168 1.00794 10
Helium (unused) (He) Helium is an atomically lightweight, chemical Gas. -268.93 Liquid Helium 0.140 0.236 4 10
Gas Carbon.png Gas Carbon (C) Carbon is an abundant, versatile element heated into a Gaseous state. 4826.85 Liquid Carbon 0.710 1.700 12.0107 30
Polluted Oxygen.png Polluted Oxygen (O2) Polluted Oxygen is dirty, unfiltered air.
It is breathable.
-182.96 Liquid Oxygen 1.010 0.024 15.9994 10
Oxygen.png Oxygen (O2) Oxygen is an atomically lightweight and breathable Gas, necessary for sustaining life.
It tends to rise above other gases.
 -182.96 Liquid Oxygen 1.005 0.024 15.9994 0
Natural Gas.png Natural Gas Natural Gas is a mixture of various alkanes in a Gaseous state.
It is useful in Power production.
-161.5 Methane 2.191 0.035 16.044 25
Steam.png Steam (H2O) Steam is a water that has been heated into a scalding Gas. 99.35 Water 4.179 0.184 18.01528 10
Sour Gas.png Sour Gas Sour Gas is a hydrocarbon Gas containing high concentrations of hydrogen sulfide.
It is a byproduct of highly heated Petroleum.
-161.5 Methane 1.898 0.018 19.044 25
Gas Phosphorus.png Gas Phosphorus (P) Phosphorus is a chemical element in a Gaseous state.  280.45 Liquid Phosphorus 0.770 0.236 30.973762 50
Gas Sulfur.png Gas Sulfur (S) Sulfur is a common chemical element and byproduct of Natural Gas production.
This selection is in a Gaseous state. 
337 Liquid Sulfur 0.700 0.200 32 10
Chlorine.png Chlorine (Cl) Chlorine is an extremely toxic chemical in a Gaseous state.  -34.6 Liquid Chlorine 0.480 0.008 34.453 20
Carbon Dioxide.png Carbon Dioxide (CO2) Carbon Dioxide toxic, atomically heavy chemical compound in a Gaseous state.
It tends to sink below other gases. 
-48.15 Liquid Carbon Dioxide 0.846 0.015 44.01 10
Propane.png Propane (unused) (C3H8) Propane is a natural alkane Gas.
It is useful in Power production. 
-42.15 Liquid Propane 2.400 0.015 44.1 25
Gas Ethanol.png Gas Ethanol (C2H5OH) Ethanol is a high toxic chemical compound. It can be used as highly effective fuel source when it's burned. 78.35 Ethanol 2.148 0.167 46.07 50
Rock Gas.png Rock Gas Rock Gas is rock that has been superheated into a Gaseous state.  2356.85 Magma 1.000 0.100 50 50
Salt Gas.png Salt Gas (NaCl) Salt Gas is an edible chemical compound that has been superheated into a Gaseous state. 1464.85 Molten Salt 0.880 0.444 50 10
Gas Steel.png Gas Steel Steel is a superheated Metal Gas composed of iron and carbon.  3826.85 Liquid Steel 0.490 1.000 54.97 50
Gas Iron.png Gas Iron (Fe) Iron is a common industrial Metal, heated into a Gas.  2749.85 Liquid Iron 0.449 1.000 55.845 50
Gas Copper.png Gas Copper (Cu) Copper is a conductive Metal heated into a Gas.  2560.85 Liquid Copper 0.386 1.000 63.546 50
Gas Aluminum.png Gas Aluminum (Al) Aluminum is a low density Metal. 2470 Molten Aluminum 0.910 2.500 63.546 50
Gas Niobium.png Gas Niobium (Nb) Niobium is a Rare Metal.
This selection is in a Gaseous state. 
4743.85 Liquid Niobium 0.265 1.000 92.9 50
Gas Tungsten.png Gas Tungsten (W) Tungsten is a superheated crystalline Metal.
This selection is in a Gaseous state. 
5929.85 Liquid Tungsten 0.134 1.000 183.84 50
Gas Super Coolant.png Gas Super Coolant Super Coolant is an industrial grade Fullerene coolant.
This selection is in a Gaseous state. 
436.85 Super Coolant 8.440 1.200 190 50
Gas Gold.png Gas Gold (Au) Gold is a conductive precious Metal, heated into a Gas.  2855.85 Liquid Gold 0.129 1.000 196.966569 50
Gas Lead.png Gas Lead (Pb) Lead is a soft yet extremely dense Refined Metal. 1749 Molten Lead 0.128 3.500 196.966569 50
Gas Mercury (unused) (Hg) Mercury is a toxic Metal heated into a Gaseous state.  356.75 Mercury 0.140 8.300 200.59 50
Nuclear Fallout.png Nuclear Fallout TBD 66.9 Nuclear Waste 0.265 1.000 92.9 50
Gas Cobalt.png Gas Cobalt (Co) Cobalt is an industrial Metal, heated into a Gas. 2926.9 Liquid Cobalt 0.420 1.000 58.9 50


  • Real-life oxygen has a "density" (molecular mass) of about 32 g/mol, as there are two oxygen atoms of 16 mass each.