In this guide, I will take a look at all of the gases currently in the game and their relative "weights".
I made a large box of neutrons and placed one tile of each material (except neutronium, because it never turns into gas) at 9000 Kelvin and 1000 kg pressure.
The easiest
The heaviest
Also shown here is a screenshot of the test suite.
Note that the most common gas that is produced during the evaporation of materials is Coke Oven Gas. Please note that the colors of the gases in this image are not representative of the amount of different gases. The cloudy brown gray in the lower right corner are different metals, but they all have the same color. Although the big orange part is all coke oven gas. This is because many of the materials in the game are stones, or they become something like stone and turn into gas when they reach a certain temperature.