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[[File:Iceberg with hole near sanderson hope 2007-07-28 2.jpg|300px|thumb|Water in three states: liquid, solid ([[ice]]), and (invisible) [[water vapor]] in the air. [[Clouds]] are the accumulations of the droplets, [[condensation|condensed]] from vapor-saturated air.]]
[[File:Iceberg with hole near sanderson hope 2007-07-28 2.jpg|300px|thumb|Water in three states: liquid, solid ([[ice]]), and (invisible) [[water vapor]] in the air. [[Clouds]] are the accumulations of the droplets, [[condensation|condensed]] from vapor-saturated air.]]


This is a structured list of articles related to [[water]] in wikipedia.
'''[[Water]]''' is a ubiquitous [[chemical substance]], composed of [[hydrogen]] and [[oxygen]], that is essential for the [[survival]] of many known forms of [[life]]. In typical usage, ''water'' refers only to its [[liquid]] [[States of matter|state]], but the substance also has a [[solid]] state, [[ice]], and a [[gaseous]] state, [[water vapor]] or [[steam]].

Water covers 71% of the [[Earth]]'s surface. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in [[aquifer]]s and 0.001% in the [[atmosphere|air]] as [[vapor]], [[cloud]]s (formed of solid and liquid water particles suspended in air), and [[precipitation (meteorology)|precipitation]]. [[Ocean]]s hold 97% of surface water, [[glacier]]s and polar [[ice cap]]s 2.4%, and other land surface water such as [[river]]s, [[lake]]s and [[pond]]s 0.6%. A very small amount of the Earth's water is contained within biological bodies and manufactured products.

Water on Earth moves continually through a [[water cycle|cycle]] of [[evaporation]] or [[transpiration]] ([[evapotranspiration]]), [[precipitation (meteorology)|precipitation]], and [[runoff (water)|runoff]], usually reaching the [[sea]]. Over land, evaporation and transpiration contribute to the precipitation over land.

Clean, fresh [[drinking water]] is essential to [[human]] and other lifeforms. Access to safe drinking water has improved steadily and substantially over the last decades in almost every part of the world. There is a clear correlation between access to safe water and [[Gross domestic product|GDP]] per capita. However, some observers have estimated that by 2025 more than half of the [[world population]] will be facing water-based vulnerability. Water plays an important role in the [[world economy]], as it functions as a [[solvent]] for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70 percent of [[freshwater]] is consumed by [[agriculture]].


==Chemical properties and use in Chemistry==
==Chemical properties and use in Chemistry==

Revision as of 15:46, 11 October 2009

Water in three states: liquid, solid (ice), and (invisible) water vapor in the air. Clouds are the accumulations of the droplets, condensed from vapor-saturated air.

This is a structured list of articles related to water in wikipedia.

Chemical properties and use in Chemistry

Physical properties

Geography

The Water Cycle
File:Sea water Virgo.JPG
Seawater

Weather

In nature and life

File:DrinkingWater 155px.jpg

Marine life

Water politics and issues

Water supply and Sanitation

An example of a Reservoir, Ladybower Reservoir.

Water in culture and sport

Poseidon, Greek god of water. The Roman water god, Neptune, was almost identical to Poseidon

Uses of Water

Fishing

References


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