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Stationeers models many of the real universe's physical laws, to simulate the behavior of things like gases, electricity, and stationeers. This is a reference guide to the underlying physical science concepts, and notes on how Stationeers is faithful or unfaithful them.

Measurement

Stationeers measures most properties using units standardized in the International System of Units ("SI"). This applies to the HUD and other visual displays, but it also applies to values used in logic circuitry, which is important to logic-based math.

Mass: "Can I Push That?"

Mass measures an amount of matter, in terms of its relationship to forces (e.g., gravity), inertia, and acceleration. Stationeers uses the SI unit gram (g) for mass.

Direct Measurement

Stationeers probably uses mass extensively behind the scenes, within the physics engine to calculate the movement of objects. In the player interface, however, only certain substances are given mass measurements:

• Ingots
• The input contents of crafting machines, and the ingredients of their recipes
• Reagent Mix
• The products of a Reagent Processor (except Soy Oil, which is measured by volume)

Implications

Ores are not measured by mass, but each unit of ore always produces one gram of product (not counting off-gas byproducts) when smelted.

The total count of the ore units output from a Centrifuge always equals the mass in grams of the mix put in. This is not faithful^{[verification needed]}, because all ores in the game explicitly include impurities. The implication is that the Centrifuge somehow reintroduces the original impurities, and in fact this can be exploited to create those impurities from nothing, if you find them useful.

Moles: "Will It Blend?"

In chemical terms, "amounts" of substance are not measured as mass, but as counts of particles. In Stationeers, the particles in question are always molecules, and the game relates these counts using the SI unit mole. A mole is 6.0 × 10²³ molecules (the Avogadro number). It is abbreviated as mol; Stationeers also uses kmol (one thousand moles) and Mmol (one million moles).

Moles Versus Mass

The reason to use moles rather than the seemingly more intuitive mass is because it makes chemistry equations less awkward. Take, for example, the combustion of hydrogen:

2H₂ + O₂ → 2H₂O + a bunch of heat

To apply real amounts of substance to this equation, you can do it very simply as long as everything is expressed in moles.

2mol H₂ + 1mol O₂ → 2mol H₂O

To express the same thing with mass, you would have to account for the very different mass per molecule of hydrogen gas, oxygen gas, and water.

4.032g H₂ + 31.999g O₂ → 36.031g H₂O

The numbers add up (because mass is conserved), but they're odd-looking, and they obscure the fact that the reaction takes more hydrogen than oxygen, molecule for molecule.

Direct Measurement

Stationeers measures all gases and other bulk fluids in moles, so you will see molar readings on, for example, Pipe Analyzers and a Handheld Tablet running the Atmos Analyzer Cartridge. These fluids are found in:

• The atmosphere (if any)
• Enclosed spaces such as rooms
• Pipes
• Pipe-fitted devices such as Furnaces and Tanks
• Portable Tanks
• Gas Canisters

Implications

The game does not include a reference to the molar masses of these fluids, but it should not normally be necessary. Ratios of one substance to another can be crucial (e.g., for Fuel), but these are always calculated by mole (see stoichiometry), not by mass or volume.

The game is not faithful to molar chemistry when it comes to the substance called "Volatiles". Volatiles behave in some chemical contexts like pure hydrogen gas (and are sometimes labeled "H2"), but in other contexts they are more similar to a hydrocarbon.