Water

Water is an inorganic compound with the chemical formula . It is a transparent, tasteless, odorless, and nearly colorless chemical substance. It is the main constituent of Earth's streams, lakes, and oceans and the fluids of all known living organisms, in which it acts as a solvent. Water, being a polar molecule, undergoes strong intermolecular hydrogen bonding which is a large contributor to its physical and chemical properties. It is vital for all known forms of life, despite not providing food energy or being an organic micronutrient. Due to its presence in all organisms, its chemical stabi

thumb|Urban flooding in a street in Morpeth, England, 2008

continuous movement of water on, above and below the surface of the Earth

landform that is formed at the mouth of a river

thumb|upright=1.5|The Earth captured in the [[Pacific Ocean side]]

right|thumb|upright=1.5|An illustration showing groundwater in aquifers (in blue) (1, 5 and 6) below the [[water table (4), and three different wells (7, 8 and 9) dug to reach it.]]

thumb|right|300px|(Center) Jet d'eau, (Geneva, Switzerland) Clockwise from top right (1) Fontana di Trevi (Rome) (2) Place de la Concorde (Paris) (3) Fountain in the Garden of Versailles (Versailles) (4) The Hundred Fountains, Villa d'Este (Tivoli, Italy) (5) Fuente de los Leones, (The Alhambra, Granada) (6) Fountain in St. Peter's Square (Rome) (7) Samson and the Lion fountain (Peterhof, St. Petersburg, Russia) (8) Dubai Fountain (Dubai)

thumb|upright=1.3|Lake Hāwea, New Zealand

thumb|Moat at Beaumaris Castle, [[Wales]] A moat is a deep, broad ditch dug around a castle, fortification, building, or town, historically to provide it with a preliminary line of defence. Moats can be dry or filled with water. In some places, moats evolved into more extensive water defences, including natural or artificial lakes, dams and sluices. In older fortifications, such as hillforts, they are usually referred to simply as ditches, although the function is similar. In later periods, moats or water defences may be largely ornamental. They could also act as a sewer.

saline water for medical purposes

publicly available water supplied to homes

water on the continents surface, rather than underground

chemical, physical, biological, and radiological characteristics of water

A seiche ( ) is a standing wave in an enclosed or partially enclosed body of water. Seiches and seiche-related phenomena have been observed on lakes, reservoirs, swimming pools, bays, harbors, caves, and seas. The key requirement for formation of a seiche is that the body of water be at least partially bounded, allowing the formation of the standing wave.

when water demand exceeds available resources

Aquaphobia (from Latin aqua, meaning "water", and Ancient Greek φόβος (phóbos), meaning "fear") is an irrational fear of water.

equation describing the flow of a fluid through a porous medium

water that has a high mineral content

thumb|right|Waterproofing conducted on the exterior of a freeway tunnel

human right recognized by the United Nations General Assembly in 2010

cyclic water pump powered by hydropower

thumb|Limescale build-up inside a pipe reduces both liquid flow through the pipe and thermal conduction from the liquid to the outer pipe shell. Both effects will reduce the pipe's overall thermal efficiency when used as a heat exchanger.

type of aqueduct built by the Romans

specific measurement of liquid pressure above a vertical datum

among the largest of Earth's aquatic ecosystems

ecosystem in a body of water

pipe organ powered by water

amount of water used by an individual, community, business, or nation

childbirth that occurs in water

one of the main factor limiting microbial activity

organic polymer matrix bearing ion-exchange functional groups

hypotheses for the possible sources of the water on Earth

person who distributes water for others

quantity of water contained in a material

artificial structure which disrupts the natural flow of water

pollution that occurs when when pollutants are released to the ground and seep down into groundwater

subset of Earth's aquatic ecosystems

steam whose temperature can be decreased without immediately condensing

ferrobacteria known by a particular common name

thumb|The restored lavoir at Bonnat, Creuse|Bonnat straddling a small stream A lavoir (, wash-house) is a public place set aside for the washing of clothes. Communal washing places were common in Europe until industrial washing was introduced, and this process in turn was replaced by domestic washing machines and by self-service laundries (British English: laundrette; American English: laundromat). The English word is borrowed from the French language, which also uses the expression , "public basin".

process of infiltration and percolation of water in the ground and aquifers

very clean, sterile water

saturated chemical mixture of bromine in water

thumb|210px|right|A nephelometer at the Kosan, Cheju Island, South Korea NOAA facility

settleable solids, in water

[[File:Bakhátas magaságyás 2.png|thumb|A schematic image of a Hügelkultur mound.

landing of an aerospace vehicle on water, either by design or in an emergency

water

underwater phenomenon due to Snell's Law

subsurface layer in which groundwater seeps up from a water table by capillary action

juvenile water

water content of the soil

mass fraction in a saturated mixture that is vapor

sudden erosion (usually by water) of either natural terrain or man-made objects (such as roads and railroads)

event focusing on perceived issues surrounding water

water purified to uncommonly stringent specifications

low tract of land

water with a lower concentration of deuterium than occurs naturally

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model to simulate effects of water in computational chemistry,