Water is a chemical compound consisting of molecules, each of which consists of two hydrogen atoms and one oxygen atom. Water is a vital resource for all living organisms on Earth. It is used for drinking, cooking, sanitary needs, electricity generation and many other purposes. Water also plays an important role in ecosystems, providing life for plants and animals. It is a universal solvent and participates in many chemical reactions. Water has three states - liquid, solid and gaseous - and c...