<unk>  (chemical formula H'2'O) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which 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, even though it provides no calories or organic nutrients. Its chemical formula,<unk> , 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°.<unk> " is the name of the liquid state of<unk>  at standard conditions for temperature and pressure. A number of natural states of<unk>  exist. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of<unk>  and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of<unk>  is steam or<unk>  vapor.<unk>  covers about 70.9% of the Earth's surface, mostly in seas and oceans. Small portions of<unk>  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<unk>  suspended in air), and precipitation (0.001%).<unk>  moves continually through the<unk>  cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea.<unk>  plays an important role in the world economy. Approximately 70% of the freshwater used by humans goes to agriculture. Fishing in salt and fresh<unk>  bodies is a major source of food for many parts of the world. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of<unk> , ice, and steam are used for cooling and heating, in industry and homes.<unk>  is an excellent solvent for a wide variety of substances both mineral and organic; as such it is widely used in industrial processes, and in cooking and washing.<unk> , ice and snow are also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, diving, ice skating and skiing.
Water
Carbonated water
Tar water
Protein 
Gripe water
Saline 
Juice
Raw water