Water (H2O) are hydrogen, oxygen, composed of two elements in inorganic substances, under normal pressure at ambient temperature is a colorless and tasteless liquid. Water is one of the most common substances, including humans, are all life on the survival of important resources, is also the organisms most important component. Water in the evolution of life played an important role. Very early human beings have had a beginning awareness of water, the ancient East and the West in plain view of all the material of water as a basic elements, water is one of the ancient Chinese Five Elements; four ancient elements of the West also said there is water.
The nature of water
Water at ambient temperature under normal pressure for the colorless and tasteless liquid. In nature, pure water is rare, water usually are many acids, alkalis, salts and other substances in solution, used to put this on is still known as the water in aqueous solution. Pure water can be platinum or quartz containers after several distillation to obtain, of course, is pure water on the relative significance can not be absolutely free of impurities. Water is a liquid, gaseous and solid-state transformation between the substances. Solid state of water known as ice; gas called water vapor. Vapor temperature is higher than 374.2 ℃, the gaseous water will not pressurized into liquid water.
