笑氣
笑氣係一種氣體，學名一氧化二氮（nitrogen oxide），符號N2O。室溫之下，笑氣無色，亦都唔會着火。笑氣有淡甜味，聞起來幾宜人。
笑氣可以麻醉人神經，令人興奮，所以叫笑氣。手術醫生、牙醫會用佢來麻醉病人，同佢止痛。因為佢有咁嘅特性，所以亦都畀人濫用。
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