Water

Definition

Water is an inorganic compound with the chemical formula H2O. 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 stability, its worldwide abundance, and its strong polarity relative to its small molecular size, water is often referred to as the "universal solvent".

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(watercourse)Aquifer Aquifer storage and recovery Arable land Aral Sea Archean Arcturus Argonium Arid Aromatic Artificial intelligence Asian philosophy Aspersion Asteroidal water Astrobiology Astrochemistry Atacama Large Millimeter Array Atmosphere Atmosphere of Ceres Atmosphere of Earth Atmosphere of Jupiter Atmosphere of Mars Atmosphere of Mercury Atmosphere of Neptune Atmosphere of Saturn Atmosphere of Uranus Atmosphere of Venus Atmosphere of the Moon Atmospheric escape Atmospheric water generator Atomic and molecular astrophysics Attenuation Avalanche Aviva Rahmani BBC BLP Kosher Baltic Sea Baptism Barcelona Barge Baruch Spinoza Base (chemistry)Base pairing Bathing Bathymetry Bay of Fundy Beer Beer's law Beilstein database Bent molecular geometry Benzene Benzonitrile Betelgeuse Betsy Damon Bill Viola Bioaccumulation Biodegradable Biodiversity Bioenergy Biology Biopiracy Bioprospecting Biosphere Bismuth Bleach Blessing (Roman Catholic Church)Blue roof Boat racing Boating Bodies of water Body of water Boiling Boiling point Boltzmann constant Boring (earth)Bottled water Bromine Buckminsterfullerene Buenos Aires Bulk cargo Bulk transport Bush tucker Bushmeat Butyronitrile C-Silicon dicarbide C70 fullerene CAS Registry Number CCP radical CRC Handbook Caffeine Calcium fluoride Calcium oxide Callisto (moon)Cambridge University Press Campylobacter Canal Canal age Capillary action Car wash Carbodiimide Carbohydrate Carbon Carbon cation Carbon dioxide Carbon disulfide Carbon monophosphide Carbon monosulfide Carbon monoxide Carbonation Carbonyl sulfide Carboxylate Carcinus Catabolism Catalysis Catchwater Catechism Cathedral of St. John the Divine Cellular respiration Ceres (dwarf planet)Cetaceans ChEBI ChEMBL Charcoal Charon (moon)ChemSpider Chemical bonding of water Chemical element Chemical formula Chemical name Chemical nomenclature Chemical polarity Chemical pulping Chemical substance Chernobyl disaster Chinese philosophy Chlorine Circumstellar disk Circumstellar dust Circumstellar envelope Cistern Cityscape Classical elements Clausius–Clapeyron relation Clean Air Act (United States)Cleaning Climate Climate change and fisheries Co-modality Cognate Coke (fuel)Color of water Comets Common-pool resource Common land Commons CompTox Chemicals Dashboard Comprehensive Assessment of Water Management in Agriculture Condensation Conflict resource Conjugate acid Conjugate base Containerization Cool early Earth Cooling tower Coral reef Coriolis effect Cosmic dust Cosmic ray Cosmochemistry Cradles of civilization Critical point (thermodynamics)Cruise ship Crustal recycling Crystal Crystal structure Cubic crystal system Cuvette Cyanamide Cyano radical Cyanoacetylene Cyanoallene Cyanobutadiynyl radical Cyanoformaldehyde Cyanomethyl Cyanopolyyne Cyclopentindene Cyclopropenone Cyclopropenylidene DNA Danny Towers Dao De Jing Dead Sea Dead water (folklore)Debye Decibel Density Department for Environment, Food and Rural Affairs Deposition (geology)Deposition (phase transition)Der Spiegel Desalination Detergent Deuterium Deuterium-depleted water Developing country Dew Diacetylene Diamagnetism Diane Burko Diarrhea Diatom Diatomic carbon Diatomic molecule Diazenylium Dicarbon monoxide Dichloromethane Diels-Alder reaction Diethyl ether Diffuse interstellar band Dihydrogen monoxide parody Dihydroxyacetone Dimethoxyethane Dimethyl ether Dimethyl sulfoxide Dimethylformamide Dione (moon)Dipole Dishwashing Disilicon carbide Dissolution (chemistry)Distillation Diving (sport)Dominique Bockelée-Morvan Doubly labeled water Drainage basin Drinking water Drip irrigation Drowning DrugBank Durand, Michigan Dutch language E-Cyanomethanimine ECHA InfoCard Earliest known life forms Earth Earth's atmosphere Earth (classical element)Earth Overshoot Day Earth atmosphere Ecohydrology Ecological economics Economic water scarcity Ecosystem service Egyptians Electrical conductivity Electrical dipole moment Electrochemistry Electrolysis of water Electrolyte Electromagnetic absorption by water Electronegativity Electrostate Emissions trading Empedocles Emulsification Enceladus Enceladus (moon)Enclosure Encyclopedia Iranica Energy Energy law Environmental good Enzyme Erosion Essential fatty acid Estuary Ethanethiol Ethanimine Ethanol Ether Ethyl acetate Ethyl formate Ethylene Ethylene glycol Ethylene oxide Ethynyl radical Euphrates EurekAlert!Europa (moon)European Community number Evaporation Evapotranspiration Exosphere Exploitation of natural resources Externality Extrasolar planet Extraterrestrial life Extraterrestrial liquid water Face washing Faucet Fault (geology)Feces Ferry Field (agriculture)Filter (water)Fire (classical element)Fire fighting Fisheries law Fisheries management Fishery Five elements (Chinese philosophy)Flash point Flavoring Flood Fluid Fluoromethylidynium Fog Folklore Food Food additive Food chain Food chemistry Food coloring Food energy Food fortification Food science Forbidden mechanism Forest Forest genetic resources Forest management Forestry law Formaldehyde Formamide Formation and evolution of the Solar System Formic acid Formyl radical Fossil fuel Fountain Fountain of Youth Fredericka Foster Freeze-drying Freezing Freight transport French revolutionary calendar Fresh water Freshwater Frost Frost weathering Fuel gas Fulminic acid GJ 1214 b Gallium Game (hunting)Game law Ganymede (moon)Gemstone Gene bank Geologic record Georgia State University Geothermal energy Germanium Ghusl Giant impact hypothesis Gibbs free energy Gills Glacier Glaciers Glaciology Gliese 436 b Global commons Glycerol Glycine Glycolaldehyde Glycolonitrile Gmelin database Gothic language Graphene Gravity Greenhouse effect Greenhouse gas Greenland Grimms' Fairy Tales Groundwater Groundwater pollution Groundwater recharge Groundwater remediation Guanzi (text)H2NCO+H2O (disambiguation)HAT-P-11b HC4N HCCN HD 189733 b HD 209458 b Habitable zone Habitat conservation Hadean Hail Hair washing Haloalkane Halonium ion Hand washing Harvard-Smithsonian Center for Astrophysics Hazard symbol Heat capacity Heat capacity of water Heat exchanger Heat of fusion Heat of vaporization Heavy water Helium Helium hydride ion Hemolithin Heptatrienyl radical Hertz Hexagonal crystal family Hexatriynyl radical High-altitude cooking Himalayas Hinduism History of the Earth Hoaxes Holy water Homochirality Huerta Hugh Kenner Human body Human right to water and sanitation Humorism Hycean planet Hydrobiology Hydrodemolition Hydroelectricity Hydrogen Hydrogen bond Hydrogen bonding Hydrogen bonds Hydrogen chalcogenide Hydrogen chloride Hydrogen cyanide Hydrogen deuteride Hydrogen fluoride Hydrogen isocyanide Hydrogen peroxide Hydrogen polonide Hydrogen selenide Hydrogen sulfide Hydrogen telluride Hydrogeology Hydrography Hydrologic cycle Hydrology Hydromagnesium isocyanide Hydronium Hydroperoxyl Hydrophilic Hydrophobic Hydrophobic effect Hydropower Hydrosphere Hydrothermal vent Hydroxide Hydroxyl radical Hygiene IHE Delft Institute for Water Education IRC +10216 Icarus (journal)Ice Ice Ic Ice Ih Ice XVIII Ice caps Ice hockey Ice sheet Ice skating Iceberg Icosahedron Imidogen Improved sanitation Improved water source Inda Sillasie Indoor air quality Indus Valley civilization Industrial Revolution Industrial mineral Industrial wastewater treatment Inorganic compound Institute of Medicine Intergalactic dust Intermodal freight transport International Bureau of Weights and Measures International Chemical Identifier International Convention for the Prevention of Pollution from Ships International System of Units International Treaty on Plant Genetic Resources for Food and Agriculture International Union for the Protection of New Varieties of Plants International Water Association International Water Management Institute Interplanetary medium Interstellar cloud Interstellar formaldehyde Interstellar medium Intertidal zone Ion Ionic water Iowa State University Iron(II) cyanide Iron(II) oxide Iron–sulfur world theory Irrigation Islam Isocyanic acid Isocyanoacetylene Isoformyl Isopropanol Isua Greenstone Belt JSmol James Joyce James Legge Jenny Holzer Johns Hopkins University Joule KEGG Kelp Kelvin Kelvin temperature scale Kerogen Ketene Ketenimine Ketenyl Ketone Kettle Kiki Smith Korolev (Martian crater)Kuiper belt Lake Lake Baikal Lake stratification Land Land-use planning Land (economics)Land degradation Land law Land management Land use Landscape Latent heat Latent heat of vaporization Latitude Laundry Leaching (agriculture)Leila Daw Leopold Bloom Life Limnology Lipid Lipids List of cleaning tools List of extrasolar candidates for liquid water List of interstellar and circumstellar molecules List of largest lakes and seas in the Solar System List of plants used in herbalism List of the largest hydroelectric power stations List of waterfalls Living water (folklore)Lone pairs Lunar water Lungfish Lungs Magic (supernatural)Magnesium cyanide Magnesium isocyanide Magnesium monohydride Mantle (geology)Marine biology Marine conservation Marine current power Marine energy Marine life Marine mammal Marine resources Maritime transport Mark Rothko Mass Meadow Medical News Today Melting Melting point Mercury (planet)Meridel Rubenstein Mesopotamia Metabolism Metal Metal (classical element)Methane Methanethiol Methanol Methoxy Methoxyethane Methyl acetate Methyl cation Methyl ethyl ketone Methyl formate Methyl isocyanate Methyl isocyanide Methyl radical Methylamine Methylene (compound)Methylene amidogen Methylenimine Methylidyne radical Methylidynephosphane Metric tonne unit Metropolis Microbe Micronutrient Mikvah Milky Way Millennium Development Goals Mineral Mineral (nutrient)Mineral rights Mineral water Mining Mining law Miscibility Misogi Modernist literature Molar mass Molar volume Mole (unit)Molecular geometry Molecular symmetry Molecular vibration Molecule Molecules in stars Monist Motif (narrative)Mpemba effect Mu Cephei Municipal water system N-Methylformamide NASA NFPA 704 Naphthalene National Academies of Sciences, Engineering, and Medicine National Ambient Air Quality Standards Natural abundance Natural capital Natural capital accounting Natural heritage Natural resource Natural resource economics Natural resource management Nature reserve Near-infrared spectroscopy Neptune Neutron moderator New York Times Nexus for Exoplanet System Science Nile Nitric oxide Nitrogen Nitrous oxide Nitroxyl Noble gas Non-renewable resource Non-timber forest product Nonpolar molecule Noodles Norman Greenwood Nuclear power Nuclear reactor Nucleophilic Nuvvuagittuq Greenstone Belt Occupational safety and health Ocean Ocean stratification Ocean temperature Ocean world Oceanography Octatetraynyl radical Odor Odorless Oil war Old English Old Faithful Old Frisian Old High German Old Saxon Oort cloud Open space reserve Oral rehydration therapy Ore Organic compound Organism Origin of water on Earth Osmotic power Otter Outer space Outline of water Overconsumption (economics)Overdrafting Overexploitation Overtone band Oxford University Press Oxidation Oxide Oxygen Oxyhydrogen Ozone Ozone depletion PAH world hypothesis PBS PFAS PH Paper manufacturing Paris Declaration on Aid Effectiveness Pasture Pat Steir Payload Peak coal Peak copper Peak farmland Peak gas Peak minerals Peak oil Peak phosphorus Peak water Pearson Education Pesticide Petro-Islam Petroleum politics Petrostate Pharmaceuticals Phase diagram Phase transition Philip Ball Phlegm Phosphine Phosphorus mononitride Phosphorus monoxide Photodissociation Photodissociation region Photosynthesis Physical water scarcity Phytoplankton Pillow basalt Pinniped Planetary habitability Planetary oceanography Planetary system Plankton Plant Plant genetic resources Plate tectonics Plato Pluto Poise (unit)Polar ice cap Polar molecule Polycyclic aromatic hydrocarbon Polysaccharide Polyyne Potability Potable water Potassium chloride Potassium cyanide Power generation Pranks Precipitation Precipitation (meteorology)Preferred IUPAC name Pressure cooker Pressure melting point Produce Propadienylidene Propanol Propene Properties of water Property law Propionaldehyde Propionitrile Propynal Propyne Propynylidyne Protein Protein folding Proto-Germanic language Proto-Indo-European language Protonated carbon dioxide Protonated cyanoacetylene Protonated formaldehyde Protonated hydrogen cyanide Pseudo-panspermia PubChem Puddle Pulp bleaching Pump Pure water Pyrene Pyrimidine Quasar REDD and REDD+RNA world hypothesis RTECS Rain Rainbow Rainwater harvesting Rainwater tank Raman spectroscopy Ramsar Convention Rangeland Rapping Rastafari movement Reactant Reclaimed water Recreation Recreational fishing Red Sea Refract Refractive index Remnant natural area Renewable resource Resource Resource curse Resource depletion Resource extraction Resource nationalism Resource war Reuse Reverse osmosis Rings of Saturn Ritual purification River delta River engineering Robert Longo Robin Canup Rock (geology)Rome Room temperature Rotterdam Runoff (water)S Persei Sacrament Sacred waters Safe water Saline water Salt (chemistry)Salt lake San Andrés (island)Sand mining Sanitation Science (journal)Scientific illiteracy Seascape Seawater Second Sediment transport Sedimentary rock Seed bank Self-ionization of water Self-replication Semiheavy water Sewage Sewage treatment Shade (shadow)Shinto SiNC Sikhism Silane Silicate Silicon Silicon-carbide cluster Silicon carbide Silicon carbonitride Silicon monosulfide Silicon monoxide Silicon tricarbide Silylidyne Simmering Simplified molecular-input line-entry system Siphon (insect)Siphon (mollusc)Ski Mask the Slump God Skiing Sledding Slurry Snowboarding Snowflake Snowmobiling Soap Sodium chloride Sodium cyanide Sodium hydroxide Sodium iodide Soil Soil conservation Soil fertility Soil health Soil resilience Solar System Solar atmosphere Solar energy Solubility Solute Solutes Solvation Solvent Sonar Soundscape Soviet Union Space.com Sparkling wine Specific heat capacity Spectroscopy Speed of sound Sponge (tool)Spring (hydrosphere)Squat lobster Stacy Levy Standard atmosphere (unit)Standard enthalpy change of formation Standard enthalpy of formation Standard molar entropy Standard state Star formation State of matter States of matter Steam Steam explosion Steam turbine Steaming Stellar atmosphere Stormwater Stratification (water)Stream Subduction Subduction zone Subglacial lake Sublimation (phase transition)Sulfanyl Sulfide Sulfolane Sulfur dioxide Sulfur mononitride Sulfur monoxide Sun Sunlight Supercritical fluid Supercritical water Superheated steam Superionic water Surface runoff Surface tension Surface water Surfing Sustainable Development Goals Sweat Syr Darya Systems ecology TW Hydrae T Tauri star Tao Taoism Taste Tau Boötis b Tayammum Teresita Fernandez Terrain Tethys (moon)Tetrahydrofuran Thales The New York Times The Water of Life (German fairy tale)Thermal conductivity Thermal insulation Thermal pollution Thermal power station Thermohaline circulation Thiocyanic acid Thioformaldehyde Thioformyl Thioxoethenylidene Thirst Tholin Three Gorges Dam Tiber Tidal force Tidal power Tide Tides Tigris Time (magazine)Titan (moon)Titanium(II) oxide Titanium dioxide Towel Tragedy of the commons Transparency and translucency Transpiration Triatomic molecule Tricarbon Tricarbon monosulfide Tricarbon monoxide Trihydrogen cation Triple point Tritiated water U.S. Department of the Interior U.S. National Research Council UNEP UNESCO UN World Water Development Report USGS Ullmann's Encyclopedia of Industrial Chemistry Ultraviolet Ulysses (novel)Underwater diving Unique Ingredient Identifier United Nations Conference on Trade and Development United Nations Convention on the Law of the Sea United Nations Convention to Combat Desertification United States Geological Survey University of California, Davis University of Houston Upper mantle (Earth)Uranus Urban ecology Urine VY Canis Majoris Valley Van der Waals force Vapor 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