|This article is about an older version of DF.|
Steam is created from the mixing of magma and water. This is distinct from mist, a similar looking product of water falling, or smoke, the product of mixing magma and anything else, or magma mist, a rare and deadly cousin.
In older versions, steam would cause massive injuries and death. In v0.27.176.38c, steam is harmless but still rendered.
Another product of water and magma mixing is obsidian.