from the Web site of http://en.wikipedia.org/wiki/Image:Chlorine-sample.jpg
Chlorine was discovered by Carl Wilhem Scheele the discoverer of many chemical substances. Chlorine is a powerful gas when concentrated and is used in bleach and disinfectants. It's used as a common disinfectant; chlorine is used in swimming pools to keep them clean. Chlorine is an element used in industry and found in some everyday products.
Chlorine was used during World War I as a choking agent. Chlorine is one of the most commonly manufactured chemicals in the United States. Its most important use is as a bleach in the manufacture of paper and cloth, but it is also used to make pesticides (insect killers), and rubber. Chlorine is used in drinking water and swimming pool water to kill bacteria. It is also as used as part of the sanitation process for sewage. Chlorine used in bleach can release chlorine gas if it is mixed with other cleaning agents.
