Acid - Sansei (English spelling) acid

Japanese: 酸性 - さんせい（英語表記）acid

(1) Chemically, it is a term that describes the property of an acid, which reacts with metals that are more electropositive than hydrogen to generate hydrogen, and reacts with metal oxides to produce salt and water. In aqueous solutions, a pH of less than 7 is considered acidic [Nagakura et al.: 1998]. (2) It describes rocks with a high _SiO2 content, and generally refers to rocks with _SiO2 of 66% or more by weight. In rock classification, rocks are classified as acidic, intermediate, basic, and ultrabasic [Abich: 1841, Beaumont: 1847]. This classification method of dividing igneous rocks into those with _SiO2 of 66%, 52%, and 45% by weight was proposed by Levinson-Lessing in 1897, and is still widely used today for its convenience [Katayama et al.: 1970]. However, it has nothing to do with the hydrogen ion concentration in solutions used in chemistry. Persilicic has the same meaning.

Source: Asakura Publishing Dictionary of Petrology Information

Japanese:

(1) 化学的には酸の性質を表す語で，水素よりも電気的陽性の金属と作用して水素を発生し，金属酸化物と反応して塩と水を作る性質を指す．水溶液では水素イオン指数がpH＜7の場合を酸性と定義する［長倉ほか : 1998］．(2) 高いSiO₂含有率の岩石を表わす語で，普通はSiO₂が重量で66％以上の岩石をいう．岩石の分類では酸性（acid），中性（intermediate），塩基性（basic），超塩基性（ultrabasic）に区分される［Abich : 1841, Beaumont : 1847］．このように火成岩をSiO₂重量が66％，52％，45％で区切る分類法はレヴィンソン─レッシングが1897年に提唱したもので，現在でも便利なために広く用いられている［片山ほか : 1970］．しかし化学で用いる溶液中の水素イオン濃度とは関係がない．過珪酸質（persilicic）は同じ意味である．

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