N20 & O2: Please review the below link for more info: http://en.Wikipedia.Org/wiki/nitrous_oxide_and_oxygen.
Answered 6/27/2013
5k views
Entonox: 50% nitrous oxide plus 50% oxygen, used as medical anesthesia gas. It acts fast & wears off fast. An example of use is in painful labour contractions.
Answered 1/3/2015
5k views
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