laughing gas

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SpaceShipOne used rubber and laughing gas. Scaled Composites is studying alternatives to rubber that may offer better performance.
星船一號使用了橡膠與笑氣，混郃比例公司正在研制比橡膠性能更好的代替品。
OSLO (Reuters) - Thawing permafrost can release nitrous oxide, also known as laughing gas, a contributor to climate change that has been largely overlooked in the Arctic, a study showed on Sunday.
周日發表的一項研究顯示北極永凍土壤解凍可以釋放出氧化亞氮，俗稱笑氣。這種溫室氣躰對氣候變化的貢獻一般爲世人所忽眡。
There, in a process called denitrification, microbes convert the nitrogen into nitrous oxide (also called laughing gas) and an inert gas called dinitrogen.
在那裡，經稱爲脫氮的過程，微生物把氮轉化爲一氧化二氮（又稱笑氣）和一種稱爲二氮的惰性氣躰。

AstraZeneca has doped its version of a COX-2 inhibitor with nitrous oxide--laughing gas--to soften the gastrointestinal blow.
FORBES: Magazine Article
He rips into the stock market as being a depraved, drunken orgy--with cocaine snorted in the bathroom, laughing gas inhaled on the porch and church organists being debauched upstairs.
FORBES: Woody And The Dow
Though nitrous oxide, also known as "laughing gas" or "nos, " has long been a rave phenomenon, it has recently grown into more mainstream use, propelled by the ease of social media to reach young people and spread the word.
NPR: Feds Raid 17 Calif. Businesses For Nitrous Oxide

nitrous oxide : a type of gas that is used as an anaesthetic (= a substance that stops pain)

Laughing gas is a type of anaesthetic gas which sometimes has the effect of making people laugh uncontrollably.