This book is unique in presenting all aspects of water. It includes discussion of the theory of a water molecule, its properties, both in the pure state and as a solvent. In particular, it emphasizes the relevance of water to life. Water is the most important liquid. It is also a vital component of all living systems. It has very unusual properties which makes it the most interesting for research and study. Contents: Introduction: Properties and Importance of Water Water Molecule: Structure and interaction The Unique and Outstanding Properties of Water Role of Water in Some Fundamental Processes Water Resources and Their Vital Role in Survival of Civilizations — Then and Now Appendices: Photosynthesis Solvation of Charged Particles Tides Dielectric Properties of Water