Explore Words Kanji Grammar Guides

Copyright © 2026 Kotomora. All Rights Reserved.

Get the Kotomora apps for iOS and Android.

Explore Words Kanji Grammar Guides About Support Privacy

Copyright © 2026 Kotomora. All Rights Reserved.

反応性 (hannousei) Japanese meaning: reactivity | Kotomora

反はん応のう性せい

は

ん

の

う

せ

い

Meanings

1

reactivity

Chemistry term referring to the tendency of a substance to undergo chemical reactions.

この金きん属ぞくは反はん応のう性せいが高たかいため、空くう気き中

ちゅう

で

すぐ

に

酸さん

化か

する

。

This metal has high reactivity, so it oxidizes quickly in air.

Kanji

反anti-
応apply, answer, yes
性sex, gender, nature

Related words

活かっ性せい
活性 is the general technical term for a substance's degree of activity, while 反応性 more narrowly describes how readily it reacts with other substances.

Word family

自じ己こ反はん応のう性せい物ぶっ質しつ
self-reactive substance

Built from

反はん応のう+性せい

Etymology

Compound of 反応 (reaction) and 性 (property, -ity). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.