A '''Chemical weapon''' is a [[weapon]], usually in gas or liquid form, that releases toxic chemicals when exploded. The most well known chemical weapon, [[Mustard gas]], was used extensively during [[World War I]]. Other types include sarin gas, nerve gas, VX, and BZ.<ref>http://www.reachingcriticalwill.org/legal/cw/cwindex.html</ref> [[Gas mask]]s and other protective gear exists to protect against chemical weapons. | A '''Chemical weapon''' is a [[weapon]], usually in gas or liquid form, that releases toxic chemicals when exploded. The most well known chemical weapon, [[Mustard gas]], was used extensively during [[World War I]]. Other types include sarin gas, nerve gas, VX, and BZ.<ref>http://www.reachingcriticalwill.org/legal/cw/cwindex.html</ref> [[Gas mask]]s and other protective gear exists to protect against chemical weapons. |