酸(さん)

さん
noun
acid; acidic substance
technicalscience
1. acid; acidic substance
A chemical substance with a pH below 7, the opposite of an alkali (base). Used as a general noun and as a suffix in names of specific acids (硫酸(りゅうさん) sulfuric acid, 塩酸(えんさん) hydrochloric acid).
レモンには酸(さん)が含(ふく)まれている。
Lemons contain acid.
酸(さん)とアルカリを混(ま)ぜると中和(ちゅうわ)反応(はんのう)が起(お)こる。
When acid and alkali are mixed, a neutralization reaction occurs.
胃液(いえき)に含(ふく)まれる強(つよ)い酸(さん)が食(た)べ物(もの)を分解(ぶんかい)する。
The strong acid contained in gastric juice breaks down food.

Used both as a standalone noun in chemistry and food contexts, and as a suffix in the names of specific acids.

Compounds

Similar / related

  • アルカリ: alkali; base — direct chemical opposite
  • 酸(す)っぱい: sour (everyday adjective for taste)
  • 酸素(さんそ): oxygen — different word with the same kanji used for its chemistry meaning

Related Words

Antonym: アルカリ (alkali)
Related: アミノ酸(さん) (amino acid)
general
Added 2026.6.3 11:08 · Revised 2026.9.2 13:02
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