Gas

This is a disambiguation page, which lists pages which may be the intended target. If a page link referred you here, please consider editing it to point directly to the intended page.

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, shown in composite below. A more complex phase change diagram can be located Here

A combined phase change diagram showing the phase changes of all in-game gasses.

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)	Liquid Molar Volume (L / mol)	Molar Mass (g / mol)
Carbon Dioxide (CO2)	Gray	28.2	0.6	218 / -55.3	N/A	517 at 218 / -55.3	265 / -8.1 at 6000	0.04	44
Nitrogen (N2)	Black	20.6	0.5	40 / -233	75 / -198	6.3 at 40 / -233	190 / -83 at 6000	0.0348	64
Nitrous Oxide (N2O)	Green	37.2	4	252 / -21	N/A	800 at 252 / -21	431 / 158 at 2000	0.026	46
Oxygen (O2)	White	21.1	0.8	56.4 / -217	90 / -183	6.3 at 56.4 / -217	162 / -111 at 6000	0.03	16
Pollutant (X)	Yellow	24.8	2	173 / -99.8	N/A	1800 at 173 / -99.8	425 / 152 at 6000	0.04	28
Volatiles (H2)	Red	20.4	1	81.6 / -192	112 / -162	6.3 at 81.6 / -192	195 / -78.1 at 6000	0.04	16
Water (H20)	Blue	72	8	273 / 0	373 / 100	6.3 at 273 / 0	643 / 370 at 6000	0.018	18

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.(NOTE: Suit air mixture should be 100% O2)

Simulation Mechanics

Concept	Simulated	Notes
Ideal Gas Law (PV=nRT)	Partial	Pressure will change with temperature, volume, and moles; Temperature will not change
Thermal Conductivity	No	Rate of energy transfer is the same for all substances
Thermal Radiation	Partial	Radiated heat is not absorbed by nearby objects
Phase Change	Partial	Gas/Liquid have simplified graph; Solid has a fixed temperature; Plasma is ignored
Fluid Dynamics	No	'Convection' parts work in pressurized environment, other parts work in vacuum
Gas Stoichiometry	No	The various reactions are arbitrary and vary depending on device used for different products from the same reactants
Gravity/Density	No	Gas/Liquid is present in all directions
Environment Volume	Yes	Each environment cube acts as a single point with fixed volume
Pipe Volume	Yes	Each pipe network acts as a single point with fixed volume depending on number of pipes segments
Flow Direction	Yes	All pumps and mixer act as check valve, passive check valve available, other valves are not one-way
Pipe Integrity	Yes	Liquid pipes hold low pressure, but may contain both liquid and gas without consequence; Gas pipes hold high pressure, but stress and break with too much liquid
Heat Transfer	Partial	Liquid temperature is controlled by gas temperature (if no gas, liquid heater will not function)