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Oxygen Not Included Game Guide

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Gases | Resources Oxygen Not Included Guide

The gaseous state is the state of the matter, which fills a given room or cave. The behaviour of gases in the game is modelled to resemble the laws that rule them in real life. Of course this is still a game, and there are some simplifications. The game allows you to transform almost any matter into the gaseous state, upon reaching the correct temperature. Thanks to that, you are able to turn many metals and substances in the liquid state into their gaseous state.

Three different gases in the same cave. - Gases | Resources - Resources - Oxygen Not Included Game Guide
Three different gases in the same cave.

Gases in the game have different colours and look similarly to smoke, so that you can quickly distinguish each type. The higher the gas concentration, the more intense the "smoke's" colour.

However, in this chapter, you will find information about naturally occurring gases and the ones which are the products of your machines. Gases can be divided into two groups. The first one is Breathable gas, the gases which your duplicates can inhale. Of course, this includes oxygen, as well as its contaminated version. Apart from that, it contains what the duplicates can inhale and still be able to function. On the other hand, the second group, as you can easily guess, is unbreathable gas. Duplicates may still stand in such surroundings, but they will start to hold their breath, and some gases may cause side effects. Gases will always be spread throughout the room, so that each field will have a similar or the same value of concentration. You will encounter such a situation when you increase the size of your base, enter a cave with a vacuum or a lower concentration of gas, or when you open an airlock to your premises.

The gases mix, but they divide into layers according to their weight (left in the normal view, right in the oxygen overlay). - Gases | Resources - Resources - Oxygen Not Included Game Guide
The gases mix, but they divide into layers according to their weight (left in the normal view, right in the oxygen overlay).

Keep in mind, that every substance in the gaseous state is assigned a certain weight. It defines whether a given gas will rise or fall if there is more than one type of gas in the room. When there is only one kind, it will strive to fill the entire room. Unlike real air, there is no such thing as the mixing of gases. This means that there can be only one type of gas in a given field (the same applies to solid and liquid matter). If there are several gases of similar density in one room, they will form layers.

Hydrogen will be located the closest to the ceiling, being the lightest gas. Then there will be a mixture of pure and polluted oxygen (though most often pure oxygen will be above the contaminated layer). Next, there is steam, chlorine and the heaviest gas: carbon dioxide. Keep this in mind when planning your base and designing rooms. It is worth to have, e.g. a small basement, where carbon dioxide will be able to calmly descend, without poisoning the main rooms.

Oxygen (O2)

Oxygen - Gases | Resources - Resources - Oxygen Not Included Game Guide

Oxygen. The most important gas in the game, due to the life-giving properties for your duplicates. It is a light gas and will rise above most other gases. It has a bluish glow. It occurs in many locations, primarily in the starting zone, in caves and some rooms where contaminated water and oxygen are located. It can be obtained in an artificial way by using machines and other resources.

Polluted Oxygen

Contaminated Oxygen - Gases | Resources - Resources - Oxygen Not Included Game Guide

Contaminated Oxygen. A light gas that will usually float on an equal level to pure oxygen or right below it. It has a colour of rotten bile. It is still breathable by your people. However, exposure will lead to illness, so you will want to minimize its quantity in the base. Naturally, you can encounter it in large numbers in the toxic biome. It is most often extracted from contaminated dirt or water. It is also produced by Morbs and by duplicates, who have the trait "Flatulence". Fortunately, you will quickly get the equipment that will remove it from your base, or you can simply pump it out of there.

Carbon Dioxide (CO2)

Carbon Dioxide - Gases | Resources - Resources - Oxygen Not Included Game Guide

Carbon Dioxide. It is the by-product of inhaling oxygen by the duplicates. It is a waste and is not suitable for inhaling. It has a black shade and looks like dark smoke. I does not occur naturally. It is the heaviest gas and will drop to the lowest levels of your base. It is worth building an extra room where you will gather it. There, you can remove it in several ways, e.g. by processing it using an algae terrarium.

Hydrogen (H2)

Hydrogen - Gases | Resources - Resources - Oxygen Not Included Game Guide

Hydrogen. The lightest gas, which will rise above all others. It has a pink colour and is unsuitable for breathing. It occurs naturally in the Purple biome. You can create it as one of the products of the hydrogen generator. It is suitable for industrial purposes, such as the production of electricity in a relevant machine.

Chlorine (Cl2)

Chlorine - Gases | Resources - Resources - Oxygen Not Included Game Guide

Chlorine. An extremely toxic gas. Not applicable in industry. It has colour that is a mixture of green and yellow shades. It is a heavy gas and it will descend, but it floats above carbon dioxide. It often causes illness. You will usually encounter it in the Purple biome. The unique resource - Bleach Stone, emits it. The only way to get rid of it is to pump it out of the base or into a room with a Morb.

Steam

Steam - Gases | Resources - Resources - Oxygen Not Included Game Guide

Steam. The gaseous state of water, that has been heated (both pure and contaminated) to above 100 degrees Celsius. It has a light blue colour and is not breathable. It can be turned into liquid water again, when cooled down. To acquire it, you need to put water in a hot room with batteries or other heat generating devices, or bring water into naturally warm rooms, e.g. near the bottom of the map.

Sometimes, you may encounter steam geysers on the map - Gases | Resources - Resources - Oxygen Not Included Game Guide

Sometimes, you may encounter steam geysers on the map. Usually there will be several similar objects in the game world, typically in the green biome. Thay will periodically generate a certain volume of steam, which will quickly turn into liqid. In some cases you will have to assist in the process either by cooling the environment or pumping steam to another, colder room. This will enable you to replenish your water reserves. Interestingly, by heating contaminated water, converting it to steam, and then cooling it, you will receive pure water.

Natural gas, Natural gas gyser.

Natural gas - a flammable, unbreathable gas - Gases | Resources - Resources - Oxygen Not Included Game Guide

Natural gas - a flammable, unbreathable gas. You'll find it only near its dedicated geysers. It's got a significant volume density, usually around 5kg per field. It can be used in your industry as a power source. By pumping it into a Natural Gas Generator, you'll be able to produce significant volumes of power. There are usually only few such geysers on a map, typically between 1 and 5.

Vacuum, The Void

The Vacuum and the strange object, which sucks in gases - The Void. - Gases | Resources - Resources - Oxygen Not Included Game Guide
The Vacuum and the strange object, which sucks in gases - The Void.

Vacuum. It is not a gas, but rather the lack of gas. It has no colour, unlike how it is in the case of gases. Duplicates will hold their breath in such an environment. Sometimes you can discover caves where there is a vacuum. If a field has this status, it means that there are no gases there. If, however, somehow you connect it to a field where there is a gas, it will start to fill the vacuum. Thus, the vacuum will disappear. However, the vacuum has a very interesting application, because its temperature is the absolute zero (-273 degrees Celsius). You can pump air out of a sealed room, in order to create an artificial vacuum.

The Void. It is not gas, but rather an unknown object that has special properties. This is a naturally occurring phenomenon. There is usually only one, somewhere at the edge of the map, and it looks like a small black hole. With one distinct difference, it only sucks in all of the nearby gases. It can be enclosed and fenced off from the rest of the world, or used to get rid of unnecessary gases such as chlorine or carbon dioxide.

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