Gas

Gases are substances that expand to fill their container.

Mechanics

• 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 (excluding Saunas). Wearing an Atmo Suit will protect them.
• Gasses of mass less than 1 gram (not including 1 gram) are readily deleted by adjacent gasses of different element that are at least 1 kg (including exactly 1 kg) that has nowhere else to diffuse to.

List of Gases

Icon	Name	Condensation point	Condenses into	SHC	TC	Light Absorption	Radiation Absorption	Density [g/mol]	Notes
	Aluminum Gas	2470.00	Molten Aluminum	0.91	2.5	50%	7%	63.546
	Carbon Dioxide	-48.15	Liquid Carbon Dioxide	0.846	0.0146	10%	8%	44.01
	Carbon Gas	4826.85	Liquid Carbon	0.71	1.7	30%	8%	12.0107
	Chlorine Gas	-34.60	Liquid Chlorine	0.48	0.0081	20%	7%	34.453
	Polluted Oxygen	-182.96	Liquid Oxygen	1.01	0.024	10%	8%	15.9994
	Copper Gas	2560.85	Molten Copper	0.386	1	50%	6%	63.546
	Gold Gas	2855.85	Molten Gold	0.1291	1	50%	3%	196.966569
	Hydrogen Gas	-252.15	Liquid Hydrogen	2.4	0.168	10%	9%	1.00794
	Iron Gas	2749.85	Molten Iron	0.449	1	50%	6%	55.845
	Cobalt Gas	2926.85	Molten Cobalt	0.42	1	50%	6%	58.9
	Lead Gas	1749.00	Molten Lead	0.128	3.5	50%	8%	196.966569
	Mercury Gas	356.75	Mercury	0.14	8.3	50%	2%	200.59
	Natural Gas	-161.50	Liquid Methane	2.191	0.035	25%	7%	16.044
	Niobium Gas	4743.85	Molten Niobium	0.265	1	50%	5%	92.9
	Nuclear Fallout	66.85	Liquid Nuclear Waste	0.265	1	50%	3%	92.9	emits 16.5 rads/cycle per 1000kg mass
	Oxygen	-182.96	Liquid Oxygen	1.005	0.024	0%	8%	15.9994
	Phosphorus Gas	280.45	Liquid Phosphorus	0.7697	0.236	50%	7%	30.973762
	Rock Gas	2356.85	Magma	1	0.1	50%	7%	50
	Salt Gas	1464.85	Molten Salt	0.88	0.444	10%	7%	50
	Sour Gas	-161.50	Liquid Methane 67.00% Sulfur 33.00%	1.898	0.018	25%	5%	19.044
	Steam	99.35	Water	4.179	0.184	10%	8%	18.01528
	Steel Gas	3826.85	Molten Steel	0.49	1	50%	7%	54.97
	Sulfur Gas	337.00	Liquid Sulfur	0.7	0.2	10%	7%	32
	Super Coolant Gas	436.85	Super Coolant	8.44	1.2	50%	6%	190
	Tungsten Gas	5929.85	Molten Tungsten	0.134	1	50%	3%	183.84
	Ethanol Gas	78.35	Ethanol	2.148	0.167	50%	7%	46.07
	Nickel Gas	2729.85	Molten Nickel	0.44	1	50%	5%	58.69
	Iridium Gas	4129.85	Molten Iridium	0.131	1	50%	88%	183.84

Trivia

• In real life, for gasses near dupe-safe temperatures and pressures (masses), the molar mass that Oxygen Not Included uses is a good approximation of density. This is because molar volume (the amount of volume a certain number of molecules take up) is mostly constant across all gasses. This is in opposition to liquids as well as gasses at very low temperatures and/or very high pressures, for which each substance would have very different molar volumes.
• Real-life oxygen has a "density" (molecular mass) of about 32 g/mol (not 16), as there are two oxygen atoms of 16 mass each. Similarly, real-life chlorine has a molecular mass of about 71 g/mol (not 30.5) and would sink below carbon dioxide, while hydrogen has a molecular mass of about 2g/mol (not 1). Many other elements often also have multiple atoms per molecule and would have a higher molecular mass than listed in the game, although these would be found outside dupe-safe temperatures.