Which gas is commonly known as the "laughing gas"?

Nitrous oxide, commonly referred to as "laughing gas," is known for its anesthetic and analgesic properties. It is used in various medical and dental procedures to induce sedation and alleviate pain. The name "laughing gas" comes from the euphoric feelings it can produce when inhaled, often resulting in laughter and a sense of happiness. This property makes it useful in settings like dentistry, where patients may experience anxiety.

The gas works by acting on the nervous system and affecting the way pain signals are processed, thus providing a calming effect. Additionally, nitrous oxide has a lower solubility in blood, which means it performs well when used as a short-acting anesthetic.

In contrast, ozone is a triatomic form of oxygen that is primarily found in the Earth's stratosphere and serves to protect against harmful ultraviolet radiation. Carbon monoxide is a colorless, odorless gas produced from incomplete combustion, which is toxic to humans. Methane, on the other hand, is a simple hydrocarbon primarily known as a major component of natural gas, and it does not have similar anesthetic effects or euphoric properties. Thus, nitrous oxide stands out as the gas known for its unique qualities related to laughter and sedation