Solids are substances in the solid state of aggregation. They make up almost 80% of the game world. Unlike liquids and gases, most of them stay in a fixed position and act as a solid ground. They can be removed by Duplicants using the Dig Tool.
A Liquid is a substance which is in a liquid state at ordinary temperatures. Large bodies of liquids are mostly found in Caves and pockets entirely full of liquids. Liquids are able to change their shape and flow, if their solid surroundings have been altered, at a slow or quick rate depending on the liquid. Duplicants are able to move through liquids but cannot breathe while submerged. Duplicants are put in danger while under water as they cannot swim, although fortunately being careful and always check to see if they always have a route climb out is something to keep an eye on. Liquids can be harvested using buildings in the Plumbing category or collected by using the Mop Tool.
Gases are vaporous substances which fill spaces devoid of solid and liquid matter. Any empty space that lacks a gas is a Vacuum. Duplicants breathe Oxygen and exhale Carbon Dioxide. Maintaining the right atmosphere in your Base is one of the most important goals in Oxygen Not Included.
Gases have different specific densities. Carbon Dioxide, for example, has a higher density than Oxygen. That means that in your base Oxygen will rise up to the top while Carbon Dioxide will sink to the bottom of your base.
Only Oxygen and Polluted Oxygen are breathable gases for your Duplicants. They will hold their breaths if they are in areas that are filled with unbreathable gases. If they can't reach an area with breathable gases they will eventually die of suffocation.
|Oxygen||Breathable||Essential for life support.|
|Polluted Oxygen||Toxic (Breathable)||Same as above – carries the risk of Disease.|
|Carbon Dioxide||Unbreathable||Exhaled by duplicants.|
|Hydrogen||Unbreathable||Fuel for power generators.|
|Natural Gas||Unbreathable||Fuel for power generators.|
|Vacuum||Unbreathable||No current use.
Found in areas that lack any gas.