Liquid Oxygen is the cryogenic liquid form of oxygen used in Oxygen Not Included primarily as a storied resource in the rocket/space systems rather than as a common base-game liquid production resource. It appears on Space POIs and can be harvested by rockets from certain locations; for example, Glimmering Asteroid Fields yield 60–180 kg per harvest cycle. Liquid Oxygen is handled like any other liquid in the game: it occupies tiles, can be piped with liquid plumbing, and exerts mass/pressure on containers and walls.
Liquid Oxygen interacts with the game’s thermal and pressure mechanics as other liquids do. Its temperature is important when transferred or stored because created oxygen in related systems is produced at 30 °C (or the temperature of the input if higher), and temperature differences change heat transfer behavior. Liquid handling components that affect thermal conductivity — such as Radiant Liquid Pipes, which double the thermal conductivity of the building material used to construct them while inheriting that material’s melting point — apply to Liquid Oxygen when it flows through them.
Because Liquid Oxygen is a liquid, it follows the same pressure-damage rules as other liquids. Liquid tiles that accumulate more than their safe mass begin to visually crack and can cause tile damage and leaks; the maximum safe pressure depends on the liquid’s mass per tile, wall thickness, tile type, and the strength of the material used. Thicker walls (3 tiles or more) are immune to pressure damage if there are no pipes running through them, and certain tiles/buildings are always immune. When designing storage or pipelines for Liquid Oxygen, calculate maximum pressure using the game’s formula and keep operational pressures below the computed maximum to avoid rounding-edge failures.
Harvest Liquid Oxygen from Space POIs (notably Glimmering Asteroid Fields) with rockets to obtain a renewable supply in mid-to-late game.
Treat Liquid Oxygen like any other liquid for piping and storage: use appropriate liquid pumps, pipes, and tank designs while considering pressure limits and tile strength.
Use Radiant Liquid Pipes or high-conductivity materials for routing if temperature control is necessary; these pipes increase thermal transfer but retain the material’s melting point.
Monitor tile pressure to prevent pressure damage from depth-stacked or high-mass liquid columns; prefer thicker or stronger-material tanks for high-pressure storage.
Remember that some in-game vents/buildings transfer germs from liquids to surfaces; where disinfection generates unnecessary duplicant activity, disable unneeded disinfection tasks when handling liquids that carry germs.
