Water (chemical formula H2O) is associate inorganic, clear, tasteless, odorless, and nearly colorless chemical substance, that is that the main constituent of Earth's layer and also the fluids of all best-known living organisms (in that it acts as a solvent. it's very important for all best-known types of life, even if it provides no calories or organic nutrients. Its statement, H2O, indicates that every of its molecules contains one chemical element and 2 element atoms, connected by valency bonds. The element atoms area unit hooked up to the chemical element atom at associate angle of 104.45°. "Water" is the name of the liquid state of liquid at normal conditions for temperature and pressure. Water happens as each "stocks" and "flows". Water is kept as lakes, water vapour, groundwater or aquifers, and ice and snow. Of the whole volume of world fresh, associate calculable sixty nine p.c is keep in glaciers and permanent snow cover; thirty p.c is in groundwater; and also the remaining one p.c in lakes, rivers, the atmosphere, and biota. The length of your time water remains in storage is very variable: some aquifers encompass water keep over thousands of years however lake volumes might fluctuate on a seasonal basis, decreasing throughout dry periods and increasing throughout wet ones. a considerable fraction of the water for a few regions consists of water extracted from water keep in stocks, and once withdrawals exceed recharge, stocks decrease.

Karthika LJ

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