Water a transparent, tasteless, odorless, & nearly colorless chemical substance & the main constituent of Earth's hydrosphere & fluids of all known living organisms (acting as a solvent). Water vital for all known forms of life, despite not providing food energy or organic micronutrients.
Earth's environment close to water's triple point, so water exists on Earth as a solid, a liquid, & a gas. Water forms precipitation as rain & aerosols as fog. Clouds made of suspended droplets of water & ice, the solid state. When finely divided, crystalline ice may precipitated as snow. Gaseous water is steam or water vapor.
Water covers ~71% Earth's surface, seas & oceans making up ~96.5%. Water also occurs as groundwater (1.7%), in glaciers & ice caps of Antarctica & Greenland (1.7%) & as vapor, clouds (ice & liquid water suspended in air), & precipitation (0.001%) or rain. Water cycle continual evaporation, transpiration (evapotranspiration), condensation, precipitation, & runoff, & usually reaching the sea.
Water plays an important role in the world economy. ~70% of the fresh water used by humans goes to agriculture. Fishing in salt and fresh water bodies has been, & continues to be, a major source of food for many parts of the world, providing 6.5% of global protein. Much of the long-distance trade of commodities (such as oil, natural gas, & manufactured products) transported by boats through seas, rivers, lakes, & canals. Large quantities of water, ice, & steam used for cooling & heating in industry & homes.
Water is an excellent solvent for a wide variety of substances, both mineral & organic; as such, it is widely used in industrial processes & in cooking & washing. Water, ice, & 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, snowboarding, & skiing.
Staying well hydrated by drinking enough clean water essential for human health & wellness, as doing so protects the kidneys, brain & other organs & systems of systems of the human body. Drinking too much water can cause water intoxication by knocking the electrolytes out of balance which causes the brain to slow down & can be fatal.
Human body water content varies from 55 to 78%, but the daily water consumption requirement varies by body size, temperature, humidity, activity level, fitness, or training exercises. 1.8 liters, 2.5 liters, 3 liters, 3.7 Liter of daily water intake for typical human adults. Water excreted from the body in multiple forms; through urine & feces, through sweating, & by exhalation of water vapor in the breath. With physical exertion & heat exposure, water loss will increase & daily fluid needs may increase as well.
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