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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 Two]]. Other types include sarin gas and BZ.<ref>http://www.reachingcriticalwill.org/legal/cw/cwindex.html</ref>

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 Two]]. Other types include sarin gas, nerve gas, VX, and BZ.<ref>http://www.reachingcriticalwill.org/legal/cw/cwindex.html</ref> Gas masks and other protective gear exists to protect against chemical weapons.