The process of addition of some unessential and unwanted particles in the pure compound or matter. Contamination can be done by adding solid composts, liquid factors and somehow by adding gaseous factors also. Mainly contamination is done in the food products to make its quantity more and due to the contamination in food products many diseases arises.
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.
Last date updated on June, 2014