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This page contains information that is either out-of-date or from a different source (e.g. Upstream SS14). Some information on this page may differ from how it actually works on Nyanotrasen.
Reason for revision: "Pull gas info from Atmospheric Technician. Reorganize properly and add new image that fit with each others."

WIP: All content listed below is still in the testing phase and is subject to change.


Nitrogen gas(N2)

Nitrogen gas.png

Nitrogen gas is colorless and undetectable to the eye. Nitrogen gas is completely harmless on its own and can safely be breathed in as long as there is adequate oxygen present. Nitrogen gas is mixed with oxygen gas to create air. About 79% nitrogen to 21% oxygen is the standard air mix.

Slime characters breathe nitrogen (not oxygen). When there's not enough nitrogen in the air, slime characters will start gasping and taking Airloss damage.

Nitrogen is very good at putting out fires. A full blown plasma and oxygen fire can be put out in seconds if a small amount of nitrogen gas is pumped in.



Oxygen gas.png

Oxygen gas is colorless and undetectable to the eye. Oxygen gas is completely harmless on its own and can be safely breathed in by non-slime characters. Oxygen gas is mixed with Nitrogen gas to create air. About 79% nitrogen to 21% oxygen is the standard air mix. As the oxygen levels in the air lower non-slime characters will begin to gasp. This usually happens around 18-19 moles of oxygen. Anything lower than around 15 moles of oxygen at standard temperature and pressure will cause you to take Airloss damage.

While alive, your character will slowly convert oxygen gas in the atmosphere into carbon dioxide. If a character spends a lot of time in a room make sure the oxygen levels are being replenished either by an air vent or by opening adjacent airlocks to nearby hallways to balance out the air levels.

Oxygen gas is not flammable on its own and will not burn unless plasma or other flammable gas is mixed in with it. A standard burn mix is 66% oxygen and 33% plasma. A higher oxygen to plasma ratio will result in a hotter burning fire. Fires require oxygen to burn, remove all the oxygen from a fire and it will burn out.

Carbon Dioxide

Carbon dioxide(C02)

Carbon dioxide.png

Carbon dioxide is colorless and undetectable to the eye. At high concentrations carbon dioxide becomes harmful and will cause toxin poison damage. Carbon dioxide will start to cause damage at 5 moles and will deal increasingly more damage as the moles increase. Carbon dioxide is often found mixed in the air around the station. Your character will slowly convert oxygen into carbon dioxide while alive.

Water Vapor

Water Vapor

Water vapor.png

Water vapor can be clearly seen as steam. The intensity of visible steam depends on the concentration of water vapor present in the air. Water vapor is completely harmless and can safely be breathed in by most species on the station as long as oxygen levels are adequate.

Water is harmful to slimepeople. Water vapor will damage slimes once integrated and they begin to properly metabolize water vapor into water.



Plasma gas.png

Plasma gas glows a pinkish purple and is visible in the air even at low amounts. Breathing in plasma gas is harmful to your character and will give you poison toxin damage depending on the concentration of plasma present in the air. 4% or more plasma will kill you almost instantly.

Plasma gas is extremely flammable but will not ignite on its own. A room full of pure plasma will not ignite, even if heated. Plasma requires an oxygenated room for combustion. Plasmafires burn oxygen and plasma to produce fire, heat, and waste gases. A plasma fire will quickly deplete the room of oxygen and will burn itself out if no more oxygen is supplied to feed the fire.


Tritium gas.png

Tritium is a high price gas formed by the combustion of oxygen with ignited plasma.

To form Tritium, there must be 96x more Oxygen than Plasma during the reaction. This means you want a 1% Plasma / Oxygen mix with perfect flow, though often you can increase that mix to 2% because most of the Oxygen survives the reaction. If there is too much plasma, the reaction will produce Carbon Dioxide instead.

The reaction of Plasma and Oxygen will consume the same amount of each. So a 50/50 ratio of these two gasses will consume all the inputs. However it will produce Carbon dioxide due to the high plasma ratio.

Tritium will also react at high temperatures to turn into Water Vapor, so when creating it for Frezon production you must separate it as soon as possible to prevent a secondary reaction.

A simple Tritium production system is a gas mixer with 2% plasma, 98% oxygen feeding into a volumetric pump, then a pipe, then a filter set to filter out Tritium with a low flowrate say 50 L/s. Place a heater on the pipe and set it to max temp to start the reaction. Only partially fill the pipe with input gasses and then turn off both the filter and input valve. Watch the reaction with a Gas Analyzer. Once the mix suddenly increases in temperature, begin introducing more input gasses and filting the outputs.

Ensure your waste flows directly into space and doesn't mix with your station waste or supply gasses.

Nitrous Oxide

Nitrous Oxide(N20)

Formed from Frezon and Nitrogen reaction above 23K which cools the surrounding environment.


Foam may infrequently seep out of air vents as a yellow cloud. Try to avoid breathing in foam, if possible, by moving out of range of the air vent or putting on a mask + oxygen tank and turning on Internal flow via the tank.


Miasma is a gas generated by corpses / Rat King. It looks like a black wave / shimmer. In large amounts it is dangerous to characters.


A blue gas with a very high value To make it, you need to mix cold tritium and oxygen in a nitrogen-filled chamber.

1:50 Trit to Oxy, 1:10 Oxy to Nitrogen. So 2% 88% 10% Trit, Oxy, Nitro is a good place to start. Keep the temperature as high as possible but under 70K for an efficient reaction.

You still get out the sum of oxygen and tritium consumed as Freezon, multiplied by the efficiency (typically 25%) so about 12.5x as much as you put tritium in.

Efficiency increases linearly from 0% to 100% between 0K and 73K (above which the reaction stops). Frezon and nitrogen will react to create nitrius oxide and drive the temperature down to 23K if you let them.

Efficiency multiplies to create more frezon per unit in (up to 51x multiplier) and any "waste" is output as nitrogen instead.

There is a secondary reaction with Nitrogen and Frezon which will cool the reaction.

Basic setup:

Create a mixer from Oxygen and Nitrogen supply (This mixer usually exists at round start). Remove all downstream mixers and replace with a long pipe, including a T junction that faces towards your Tritium reaction.

Add a volumetric pump that feeds gasses in from your Tritium reaction. Add a few filters (each one sitting on top of the straight pipe) for various gasses - Frezon, which goes into a connector port - Nitrogen, which needs to be set to a low rate and goes into waste - Nitrus oxide, which also needs to go to waste

Add a Manual valve that goes to waste also, in case you need to dump everything and start over. You might also find a connector port with a volumetric pump allowing you to reintroduce frezon as a useful addition.

Place a freezer unit on top of the pipe, ensure it has power and set it to 0. It will revert to about 72K. It's only required to start the reaction.

1. All input and output filters should be off, except the Nitrus one.

2. Set the input mixer of oxy/nitro to 90%/10% and introduce a small amount of these. Then turn it off

3. Set the input pump for Tritium on for a very short time. Use your gas analyzer to confirm gasses are present

4. As you watch the gas, the freezer should cool it. Suddenly you'll see frezon formed and the gas will cool down rapidly (it is being cooled by the frezon and nitrogen reaction)

5. Introduce more oxy, nitrogen and tritium. If you do this too fast the temperature will raise above 70K and you must stop. You might need to dump all the gas and return to step 1.

6. Turn on the frezon filter

7. Once nitrogen goes above 10%, you need to turn on the nitrogen filter.

8. Try to keep the Frezon reaction as close to 70K as you can. You might want to rapidly filter out and add nitrogen to create more heat. I also filter Oxygen out of the Tritium waste and use that to heat my frezon production.

500 moles of Frezon sells for 500*7 spacebucks or 3,500 which is a useful supply box. So once you have more than this I suggest you sell your first canister to supply.

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