
This guide covers the current gases in the game and their density. Density determines which gas floats on top of another.
Other ONI Guides:
The Different Weights of Gasses
I created a large box made of neutronium and placed one tile of each material in it, except neutronium. The temperature was set to 9000 Kelvin, and the pressure was 1000 kilograms. This helped me see which materials turn into gases and their relative densities. I experienced game crashes and errors due to the high pressure.
The game even entered a state where materials would not change states. For instance, hot water at 9000 Kelvin would not boil. Listed below are the gases, ordered from lightest to heaviest.
Lightest
- Hydrogen
- Helium
- Carbon
- Oxygen
- Polluted Oxygen
- Natural Gas
- Steam
- Chlorine
- Phosphorus
- Carbon Dioxide
- Rock Gas
- Steel
- Copper
- Tungsten
- Gold
Heaviest
Also here is a screenshot of the testsetup.

It’s interesting to note that the most common gas that is produced by having materials evaporate is Rock Gas. Please note that the colors of the gases in this picture aren’t representative of how many different gasses there are.
The muddy brown grey in the lower right corner are the all the different metals and they all have the same color. Although the big orange part is all Rock Gas. This is because many materials in this game are rocks, or they become something rock like and turn into Rock Gas once they reach a certain temperature.
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