Answer
Nitrous oxide, commonly known as laughing gas, was the subject of Davy's experimentation in 1799. This colorless, non-flammable gas has a slightly sweet odor and taste, and it has been used as an anesthetic and pain reliever since the early 19th century. Davy's experiments with nitrous oxide led to the discovery of its anesthetic properties, and he is credited with introducing its use in dentistry and surgery.