酸性|さんせいsansei[0]heiban (flat)

1. noun, chemistryacidity
2. no-adjective, chemistryacidic
   パイナップルやレモンのような酸性さんせいの果実かじつはすっぱい。↗

   Acid fruits like pineapples and lemons are sour.

• Related酸味さんみNeutralSourness as a taste (「酸味が強い」). It describes flavor, not the chemical property that 「酸性」 names.
• RelatedすっぱみCasualColloquial and rare word for a sour taste. Everyday speech prefers 「酸味」 or 「酸っぱさ」; 「酸性」 is the chemical property, not a taste.
• Related酸っぱさNeutralThe degree of sourness or tang of a taste, as in 「レモンの酸っぱさ」. Common in everyday speech; about flavor, not chemistry.
• Antonymアルカリ性アルカリせいNeutralAlkalinity, the opposite of 「酸性」 (「アルカリ性食品」). Fairly common in written Japanese.
• Antonym塩基性えんきせいWrittenChemical term for basicity, i.e. alkalinity, the opposite of 「酸性」. Used mainly in textbooks and academic papers.

Use 「酸性」 for acidity as a chemical property (「酸性雨」). For sour taste pick 「酸味」 or 「酸っぱさ」. The opposite is 「アルカリ性」; in academic chemistry writing, 「塩基性」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 酸さんの性質せいしつを持もっていること。