A gas chamber is an apparatus for killing humans or other animals with gas, consisting of a sealed chamber into which a poisonous or asphyxiant gas is introduced. Poisonous agents used include hydrogen cyanide and carbon monoxide. As implemented in the United States, the gas chamber is considered to be the most dangerous, most complicated, most time-consuming and most expensive method of administering the death penalty. It is also notoriously impossible to halt once initiated, which has occurred in the case of stays, such as in the case of Burton Abbott. The same event supposedly occurred in the final, completed execution of Caryl Chessman in 1960. The condemned person is strapped into a chair within an airtight chamber, which is then sealed. The executioner activates a mechanism which drops potassium cyanide (or sodium cyanide) pellets into a bath of sulfuric acid beneath the chair; the ensuing chemical reaction generates lethal hydrogen cyanide gas.
The gas is visible to the condemned, who is advised to take several deep breaths to speed unconsciousness. Nonetheless, the condemned person often convulses and drools and may also urinate, defecate, and vomit.
Following the execution the chamber is purged with air, and any remnant gas is neutralized with anhydrous ammonia, after which the body can be removed (with great caution, as pockets of gas can be trapped in the victim's clothing)
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