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Gas may refer to:

• Atmosphere
• Carbon Dioxide (CO₂)
• Fuel (66.6% H₂ + 33.3% O₂)
• Hydrogen (H₂)
• Nitrogen (N₂)
• Nitrous Oxide (N₂O)
• Oxygen (O₂)
• Pollutants (X)
• Volatiles
• Water (H₂O)

Gases

Stationpedia has simple phase diagrams for all Gases, a more complex phase change diagram can be located Here

Name	Filter Color	Molar Heat Capacity (J⋅K−1⋅mol−1)	Molar Heat of Fusion (kJ⋅K−1⋅mol−1)	Melting Point (K / °C)	Boiling Point at 100 kPa (K / °C)	Minimum Condensation (kPa at K / °C)	Maximum Liquid Temperature (K / °C at kPa)
Carbon Dioxide (CO2)	Gray	28.2	0.6	218 / -55.3	N/A	517 at 218 / -55.3	265 / -8.1 at 6000
Nitrogen (N2)	Black	20.6	0.5	40 / -233	75 / -198	6.3 at 40 / -233	190 / -83 at 6000
Nitrous Oxide (N2O)	Green	37.2	4	252 / -21	N/A	800 at 252 / -21	431 / 158 at 2000
Oxygen (O2)	White	21.1	0.8	56.4 / -217	90 / -183	6.3 at 56.4 / -217	162 / -111 at 6000
Pollutant (X)	Yellow	24.8	2	173 / -99.8	N/A	1800 at 173 / -99.8	425 / 152 at 6000
Volatiles (H2)	Red	20.4	1	81.6 / -192	112 / -162	6.3 at 81.6 / -192	195 / -78.1 at 6000
Water (H20)	Blue	72	8	273 / 0	373 / 100	6.3 at 273 / 0	643 / 370 at 6000

Phase changes have been added to the game system and most gases now have an associated Liquid and a pure solid phase.

The following exist only in solid state and have no gaseous form: Charcoal, Coal, Silicon, Iron, Copper, Nickel, Silver, Gold, Lead, Uranium.

Mixtures

Name	Contents	Tank Color	Notes
Fuel	67% H2, 33% O2	Orange	Autoignition at 573.15 K / 300 °C
HydroNox	50% H2, 50% N2O	N/A	Autoignition at 323.15 K / 50 °C
Air	75% N2, 25% O2	White	16 kPa Partial Pressure O2 minimum is required for human player breathing. Hyperoxia is not simulated.

Simulation Mechanics

• Ideal gas law (PV=nRT) is simulated.
• Thermal conductivity is not simulated. (f.e. heat is transferred at the same fixed rate for all substances; structures and devices are ignored)
• Thermal radiation is simulated. (caveat: radiated infrared is not absorbed by nearby objects)
• Phase change is simulated. (caveat: simplified and with fixed temperature for solid state)
• Fluid dynamics are not simulated. (caveat: thermal convection is partially simulated)
• Gravity is not simulated. Density is also not simulated. (gas pressure determines liquid pressure and liquid is present in all directions)
• Each environment grid cube acts as a single point.
• Connected pipes network act as a single point. (valves, pumps, mixers, etc act as pipe network splitter)
• All pumps/mixer also act as a check valve.
• Gas stoichiometry is not used. (H₂O -> 2H₂ + O₂, 2H₂ + O₂ -> H₂O, 4H₂ + 2O₂ -> 13CO₂ + 5X)
• Pipes have arbitrary stress value determined by amount of non-correct phase of substance within them (liquid in a gas pipe).
• [bug?] Liquid temperature is controlled by gas temperature. (if no gas present, liquid heater will not function)