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The multiple arches of the Pont du Gard in Roman Gaul (modern-day southern France). The upper tier encloses an aqueduct that carried water to Nimes in Roman times; its lower tier was expanded in the 1740s to carry a wide road across the river.
The multiple arches of the Pont du Gard in Roman Gaul (modern-day southern France). The upper tier encloses an aqueduct that carried water to Nimes in Roman times; its lower tier was expanded in the 1740s to carry a wide road across the river.

Water is an inorganic compound with the chemical formula H2O. It is a transparent, tasteless, odorless, and nearly colorless chemical substance, and it is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite not providing food energy or organic micronutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. "Water" is also the name of the liquid state of H2O at standard temperature and pressure.

Because Earth's environment is relatively close to water's triple point, water exists on Earth as a solid, a liquid, and a gas. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor.

Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume (about 96.5%). Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea. (Full article...)

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Bottle for distilled water in the Real Farmacia in Madrid
Distilled water is water that has been boiled into vapor and condensed back into liquid in a separate container. Impurities in the original water that do not boil below or near the boiling point of water remain in the original container. Thus, distilled water is a type of purified water. (Full article...)

Did you know (auto-generated) - load different entries

  • ... that micronations have claimed territory in Antarctica, in international waters, and in space?
  • ... that the historical lands and fishing grounds of the Skinpah were buried underwater by the construction of The Dalles Dam?
  • ... that 80 acres (32 ha) of Hog Island were farmland in 1923, but only 15 acres (6 ha) were above water in 1974?
  • ... that the design for the water playground at Chelsea Waterside Park was criticized because local residents thought that the sprinklers resembled sex toys?
  • ... that William D. Dunham threw a lifejacket to the Japanese pilot he shot down in aerial combat, after the pilot parachuted into the water?
  • ... that Olympic diver Millie Hudson, who attempted to swim across the Strait of Gibraltar in 1928, was a member of the Hammersmith Ladies Swimming Club along with Belle White, the first British diver to win an Olympic medal?

More did you know - show different entries

DYK Question Mark
DYK Question Mark

... that there are at least 15 different forms of crystalline ice?

... that water memory is a controversial homeopathic concept, which holds that water is capable of containing "memory" of particles dissolved in it?

Water News

Note: this section was updated in February 2020

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General images

The following are images from various water-related articles on Wikipedia.

Related portals


Lake Nyos – WikiProject Lakes
  • WikiProject Rivers is a WikiProject which aims primarily to describe the Earth's rivers in a consistent and complete fashion. The parent of this WikiProject is the WikiProject Geography.
  • WikiProject Water provides information on water purification.
  • WikiProject Sanitation provides information on all issues surrounding sanitation, including wastewater management.
  • WikiProject Lakes describes the Earth's lakes. The project aims to consolidate and unify pages relating to lakes around the world.
  • WikiProject Dams is a WikiProject formed to organize and improve articles related to dams.

Things you can do

Here are some tasks awaiting attention:
  • Stubs : Expand water stubs
  • Other :
    • Invite water experts to contribute their information.
    • Add your expert knowledge for your local river at WikiProject Rivers.
    • Help rotate/refresh the three items in the "Did you know?" box.
    • Expand articles on local lakes at WikiProject Lakes
    • Write or improve an article on a country whose water sector you know well at Category:Water supply and sanitation by country

Associated Wikimedia

The following Wikimedia Foundation sister projects provide more on this subject:

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This page was last updated at 2024-01-02 09:52 UTC. Update now. View original page.

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