Water is essential for life as: (1) regulator of body temperature (2 This review is structured as follows. Water is relatively small inorganic molecule, but organic life is highly dependent on this tiny molecule. It is the only substance on the earth that occurs abundantly in all three physical states (gas, liquid and solid). Structure of water. It is anomalous in many of its physical and chemical properties. Sectiondiscusses the extraordinary and sometimes anomalous properties of water from the