空氣一種無色、無嗅、無味的氣體混合物，主要由氮氣（約占78％）和氧氣（約占21％）組成，還有少量的氬、二氧化碳、氫、氖、氦及其它氣體 A colorless, odorless, tasteless, gaseous mixture, mainly nitrogen(approximately78 percent) and oxygen(approximately21 percent) with lesser amounts of argon, carbon dioxide, hydrogen, neon, helium, and other gases.
