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.

Water is composed of hydrogen and oxygen molecules and is essential for the existence life. Water usually refers to its liquid state. Water's solid state is referred to as ice and its gaseous state, water vapor, or steam.

The oceans make up 97% of water on Earth while other forms (such as glaciers and lakes) make up 3%.

[edit] Chemical properties and use

• Water (molecule)
• Electrolysis of water
• Water of crystallization
• Dealkalization of water
• Self-ionization of water
• Water-in-water emulsion
• Water purification
• Water (data page)
• Hard Water / Soft Water
  • Water softening
• Water absorption
• Heavy water
• Distilled water
• Salinity
  • Saline water
  • Seawater
• Hydrate
• Boiling

[edit] Physical properties

• Water (properties)
  • Color of water
  • Water vapour
    • Vapour pressure of water
    • Steam
  • Ice
    • Lunar ice
  • Optical properties of water and ice
  • Water quality
  • Water (data page)
• Mineral water

[edit] Geography

• Origin of water on Earth
  • Evolution of water on Mars and Earth

The Water Cycle

• Hydrosphere
  • Hydrology
    • Water distribution on Earth
  • Water cycle
  • Groundwater
• Body of water
  • Ocean
  • Sea
    • Tide

Seawater

• • Seawater
    • Saline water
    • Brine
    • Brackish water
  • River
    • Drainage
      • Drainage divide
      • Drainage basin
  • Lake
• Freshwater
• Glacier
• Waterfall
  • List of waterfalls

Formation of a Waterfall		Victoria Falls

[edit] Weather

• Precipitation (meteorology)
  • Rain
  • Freezing rain
  • Drizzle
  • Snow
  • Snow pellets
  • Snow grains
  • Ice pellets
  • Hail
  • Ice crystals
  • Dew
  • Hoarfrost
  • Atmospheric icing
  • Glaze ice
• Clouds
• Fog
• Mist
• Spindrift
• Flood
• Wave
  • Wind wave
  • Tsunami
• Drought

[edit] In nature and life

• Origin of water on Earth
  • Evolution of water on Mars and Earth
• Water intoxication
• Drinking water
• Drowning
• Dehydration

[edit] Marine life

• Marine biology
• Hydrobiology
  • Aquatic ecosystem

v • d • e Aquatic ecosystems General Algal bloom · Aquatic ecosystems · Acoustic ecology · Aquatic adaptation · Aquatic animals · Aquatic plants · Aquatic toxicology · Cascade effect · Ecohydrology · Hydrobiology · Marine biology · Productivity · Ramsar Convention · Trophic level · More... Marine Marine ecosystem · Aquatic layers · Benthos · Black smokers · Census of Marine Life · Cold seeps · Coral reefs · Deep water corals · Intertidal wetland · Kelp forests · Pelagic fish · Demersal fish · Deep sea fish · Estuaries · Intertidal ecology · Lagoons · Large marine ecosystem · Mangroves · Marine biomes · Marine ecoregions · Marine larval ecology · Ocean habitats · Salt marshes · Tide pool · Wild fisheries · More... Freshwater Freshwater ecology · Freshwater biomes · Freshwater ecoregions · Freshwater fish · Hyporheic zone · Lentic ecosystems · Limnology · Lotic ecosystems · Lake stratification · Rheotaxis · Stream bed · Upland and lowland · Wetlands · Environmental quality · More... Ecoregions Ecology of the Everglades · Ecology of the San Francisco Estuary · Ecosystem of the North Pacific Subtropical Gyre · Freshwater ecology of Maharashtra Issues Conservation ecology · Fisheries and climate change · Marine chemistry · Marine conservation · Marine conservation activism · Marine pollution

[edit] Politics and issues

• Water politics
  • Water politics in the Middle East
  • Water politics in the Jordan River basin
• Water law
• Water right
• Water resources
  • Water resources of the People's Republic of China
  • Water resources of Singapore
• Reuse of water bottles
• Water crisis
  • Water conservation
    • Water efficiency
    • Water footprint
• Water industry
  • Water privatization
  • Water management
• Water conflicts
• Water export
• Water pollution

[edit] Supply and sanitation

An example of a Reservoir, Ladybower Reservoir.

• Water supply
  • Water supply network
    • Reservoir
    • Dam
    • Water tower
    • Aquaduct
    • Pump
    • Water well
    • Drinking Fountain
    • Water pipe
      • Plumbing
    • Tap (valve)
• Sanitation
• Drinking water
• Water flouridation
  • Opposition to water fluoridation

v • d • e Water supply and sanitation in South America Sovereign states Argentina · Bolivia · Brazil · Chile · Colombia · Ecuador · Guyana · Panama1 · Paraguay · Peru · Suriname · Trinidad and Tobago1 · Uruguay · Venezuela Dependencies Aruba1 / Netherlands Antilles1 (Netherlands) · Falkland Islands / South Georgia and the South Sandwich Islands (UK) 2 · French Guiana (France) 1 Territories also in or commonly considered to be part of North America and/or Central America.  2 Territories also in or commonly considered to be part of Antarctica.

v • d • e Water supply and sanitation in North America Sovereign states Antigua and Barbuda · Bahamas · Barbados · Belize · Canada · Costa Rica · Cuba · Dominica · Dominican Republic · El Salvador · Grenada · Guatemala · Haiti · Honduras · Jamaica · Mexico · Nicaragua · Panama1 · Saint Kitts and Nevis · Saint Lucia · Saint Vincent and the Grenadines · Trinidad and Tobago1 · United States Dependencies and other territories Anguilla · Aruba1 · Bermuda · British Virgin Islands · Cayman Islands · Greenland · Guadeloupe · Martinique · Montserrat · Netherlands Antilles1 · Puerto Rico · Saint Barthélemy · Saint Martin · Saint Pierre and Miquelon · Turks and Caicos Islands · United States Virgin Islands 1 Territories also in or commonly considered to be part of South America.

[edit] In culture and sport

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

• Water deity
• Water (classical element)
• Holy water
• Water sport (recreation)
  • List of water sports
    • Swimming
    • Water polo
• Winter sport
• Water gun
• Water fight
• Fountain

[edit] Uses

• Water wheel
• Hydropower
  • Water turbine
  • Steam engine
• Drinking
  • Drinking water
  • Tap water
  • Bottled water
  • Drinking vessel
    • Glass (drinkware)
• Water clock
• Irrigation
• Use of water in fire fighting
• Professional diving
• Water transport
• Bathing
  • Sink
  • Bathtub
  • Shower
• Washing
  • Pressure washer
• Naval warfare

[edit] Fishing

v • d • e Fisheries and fishing topic areas Fisheries Fisheries science · Wild fisheries · Oceanic habitats · Fish farming · Aquaculture · Fish diversity · Fish diseases · Fisheries management · Fishing quota · Sustainability Fishing Fisherman · Artisan fishing · Fishing villages · Fishing vessels · Fishing history Industry Commercial fishing · Processing · Products · Seafood · Marketing · Markets Recreational Angling · Game fishing · Fly fishing · Catch and release Techniques Gathering · Spearfishing · Line fishing · Netting · Trawling · Trapping · Other Tackle Hook · Line · Sinker · Rod · Bait · Lures · Artificial flies · Bite alarms Locations Fishing by country · Fishing villages · Fishing banks · Fish ponds List of articles by topic areas · Alphabetical list of articles · Fisheries glossary

v • d • e Angling and game fishing Angling Fly fishing · Boat fishing · Trolling · Casting · Spey casting · Surf fishing · Rock fishing · Bank fishing · Kayak fishing · Centerpin fishing · Coarse fish · Rough fish · Bottom fishing · Traditional fishing boats · Fishing tournaments · Angling personalities · Television series Game fishing Big-game fishing · Land-based game fishing · Salmon run · International Game Fish Association The catch Catch and release · Tag and release · Bag limits · Minimum landing size · Rough fish · Panfish · Priest (tool) · Ike jime Sport fish Bass · Carp · Fly target species · Mahi-mahi · Marlin · Porgie (bream) · Shad · Smelt whiting · Striped bass · Swordfish · Walleye

v • d • e Wild fisheries Wild fisheries Ocean fisheries · Forage fisheries · Krill fisheries · Kelp fisheries · Eel fisheries · Shrimp fisheries · Crab fisheries · Cod fisheries · Ocean habitats · Shoaling and schooling · Migration · Sardine run · Fish ladder · Fish screen · Water column · Marine snow · Upwelling · Humboldt current · Algal blooms · Dead zones · Fish kill Fisheries science Population dynamics of fisheries · Shifting baseline · Fish stock · Fish mortality · Stock assessment · Fish measurement · Fish counter · Biomass · Fisheries acoustics · Acoustic tags · GIS and aquatic science · EcoSCOPE · Age class structure · Trophic cascades · Marine biology · Aquatic ecosystems · Diversity of fish · Bioeconomics · Ecopath · Fishbase · FMAP · Census of Marine Life · Fisheries databases · Institutes · Fisheries scientists Management Fisheries management · Monitoring control and surveillance · Vessel monitoring system · Fishery Resources Monitoring System · Catch reporting · Fisheries observer · Illegal, unreported and unregulated fishing · Fisheries organizations Quotas Individual fishing quota · Minimum landing size · Incidental mortality · Discards · Bycatch · Cetacean bycatch · Turtle excluder device · Shrimp-Turtle case · EU quotas · EU MLS · Exclusive Economic Zone Sustainability Sustainable fisheries · Overfishing · Marine pollution · Mercury in fish · Environmental effects of fishing · Fisheries and climate change · Destructive fishing practices · Maximum sustainable yield · Marine Protected Area · Marine reserve · Marine conservation · Marine conservation activism · Sustainable seafood · Marine Stewardship Council · Friend of the Sea · Seafood Watch · Oceana · Sea Around Us Project · WorldFish Center · Defying Ocean's End · PROFISH · The Sunken Billions · End of the Line

[edit] See also