|The process through which the contaminants like chemicals, biological contaminants, gases are completely purified for drinking purpose, lab, industrial usage. The methods of water purification include sedimentation, filtration, and distillation. Chemical methods include fluorination, flocculation and Ultraviolet light usage.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.