Quality of Water:A Systematic Review

(H20) is the most abundant compound on Earth's surface, covering 70 percent of the planet. In nature, waterexists in liquid, solid, and gaseous states. It is in dynamic quilibrium between the liquid and gas states at standard temperature and pressure. At room temperature, it is a tasteless and odorless liquid, nearly color less with a hint of blue. Many substances dissolve in water and it is commonly referred to as the universal solvent. Because of this, water in nature and in use is rarely pure and some properties may vary from those of the pure substance. The present paper reviews research studies on quality of water.