不ふ活かっ性せい

noun which may take the genitive case particle 'no'

inert; noble; neutral

Chemistry term describing substances that do not readily react, such as inert gases or noble metals.

• アルゴンは不活ふかっ性せいガスの一いっ種しゅです。

  Argon is a type of inert gas.

• 金きんは化か学がく的てきに不活ふかっ性せいな金きん属ぞくとして知しられている。

  Gold is known as a chemically inert metal.

noun which may take the genitive case particle 'no'

inactive

General term for lack of activity or reactivity; less common than the chemistry sense.

• この触しょく媒ばいは時じ間かんが経たつと不ふ活かっ性せいになる。

  This catalyst becomes inactive over time.