water
Water (chemical formula: H2O) is composed of hydrogen, oxygen two elements of inorganic matter, at room temperature and pressure for the colorless and odorless transparent liquid. Water is one of the most common substances on Earth, and it is an important resource for the survival of all life, including human beings, and the most important part of the organism. Water plays an important role in the evolution of life. Mankind began to know the water very early, the ancient and modern material view of the ancient and modern view of the water as a basic component of the water is one of the ancient Chinese five elements; Western ancient four elements that also have water. ...