H₂O

Chemical compound of two hydrogen atoms and one oxygen atom.

H₂O, also known as water, is a chemical compound composed of two hydrogen atoms and one oxygen atom. It is essential for life on Earth, serving as a solvent in biological processes, regulating temperature, and supporting ecosystems. Water exists naturally in three states—solid (ice), liquid, and gas (water vapor)—and plays a critical role in the hydrological cycle.

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