Water comes in three states, right? Not exactly. There are at least 22 different phases of water (19 are ice, two are liquid, and one is gas). One of the most useful exotic phases of water is the "supercritical" state achieved at very high temperature and pressure. Under those conditions, water can be dense like a liquid but flow like a gas. In nature, supercritical water likely exists at the lowest reaches of geothermal reservoirs.
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