The Gases Update

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New Gases & Liquids

This update adds eight new gases and liquids to the game, each with unique properties, phase behaviour, and uses. Volatiles has also been renamed to Methane to better reflect what it actually is. Stationpedia has also received an update to help convey the new gasses, and all their properties as much as possible.

Fuels & Oxidisers

Hydrazine is a monopropellant fuel that requires no oxidiser to combust, only a heat source or a spark. It is a stable liquid at room temperature and human livable pressures, but leaving free standing pools of it laying around likely isnt safe. Due to it reacting with itself, you can always ensure complete combustion once initiated.

Hydrogen is the most efficient fuel by weight, and combustion temperature, for rocketry. When combusted with Oxygen it burns cleanly into Water(Steam), making it a natural fit for bases running hydroponics or electrolysers. Liquid Hydrogen is also available.

Liquid Alcohol is a versatile room-temperature liquid only fuel that can be produced using the new Fermenter. It will irreversibly evaporate into Methane, so be sure to maintain its temperature and pressure properly to keep its form.

Ozone is a highly energetic oxidiser. Like Nitrous Oxide it will create faster combustion, compared to oxygen, when burned with a fuel. It is liquefiable and has a broader liquid range and lower latent heat making it easier to work with compared to NoS.

Coolant & Heat Storage

Silanol is the premium refrigerant for phase-change heat pumping. It has an extremely high heat capacity and a wide liquid range, making it more capable than Pollutant as a working fluid. Liquid Silanol is also available.

Liquid Sodium Chloride remains in liquid form at extremely high temperatures, making it an excellent medium for storing heat energy. At room temperature it exists as a solid. Sodium has no gas form and will decompose into Pollutant if heated too high, or if exposed to too low of pressures. It is best processed in a hot furnace, and tapped off via the liquid connection, to prevent 'low' temperature salts from freezing in pipes.

Inert

Helium is a fully inert gas. It will neither freeze nor condense into liquid, making it a useful working gas in atmospherics systems where phase-change needs to be avoided.

Hazardous

Hydrochloric Acid is a highly toxic gas that is liquid at room temperature and pressure. It has been added to the global atmosphere of Venus.

Ice prefabs and gas filters have been added for all new substances. A small amount of Hydrogen has also been added to Vulcan's global atmosphere, and to volatile ice ore.

Combustion Overhaul

Combustion has been fully refactored to be data driven. This allows each fuel and oxidiser to have its own unique reactions, rather than all combustion following a single shared model. The H2 Combustor has been updated to use the standard combustion code, with output products depending on the input gas mix. This means producing your own water is now different, and you'll want to look at all the combustion methods to find the best source of water for your world and setup.

To help make sense of the new chemistry, the Stationpedia gas pages now include a Combustion Info Panel. This shows the input ratios, auto-ignition temperature, and output products for any gas that will combust with the one you