Group of chemical elements including helium, neon, argon, krypton, xenon, and radon; characterized by being colorless, odorless, and chemically inactive; formerly called [[惰性气体|惰性氣體|duo4 xing4 qi4 ti3]]

aerodynamics; pneumodynamics

Process by which gases mix or spread due to the motion of their particles; specifically used in the context of isotope separation

A gas in the atmosphere that contributes to the greenhouse effect, such as water vapor, carbon dioxide, or ozone

gas produced by the breakdown of organic matter in the absence of oxygen

inert gas; noble gas, such as helium, neon, or argon. These gases are chemically inactive and colorless. This term is an older name for [[稀有气体|稀有氣體|xi1 you3 qi4 ti3]].

any of the chemically inert gaseous elements of group 18 of the periodic table

aerodynamics; pneumatics