Which substance is referred to as 'Laughing Gas'?

The substance referred to as 'Laughing Gas' is nitrous oxide. This gas is known for its euphoric effects when inhaled, leading to its nickname. Nitrous oxide has been used historically in dental procedures and as an anesthetic due to its analgesic properties. It works by depressing the central nervous system, which can create a feeling of lightheadedness or laughter, hence the name 'Laughing Gas.'

In contrast, ethanol is a type of alcohol commonly used as a recreational drink. Chloroform and ether are both organic compounds that have been historically used as anesthetics but do not possess the same properties or effects that nitrous oxide does. Each of these other substances has its own applications in medicine and industry but lacks the specific euphoric effects that characterize nitrous oxide.