conductivity water

…Water that has been desalted and purified using ion exchange resins, etc., rather than distillation, can also be used in the same way as distilled water, and in the Japanese Pharmacopoeia, it is called purified water together with distilled water. Pure water also has high electrical resistance, and water that has been purified to the extent that it can be used to measure the conductivity of a solution (electrical resistance of 1×10 ⁶ Ω･cm or more; normal distilled water has an electrical resistance of about 10 ⁵ Ω･cm) is called conductivity water. Water dissolves a very large number of substances, so ordinary water, such as tap water, well water, rainwater, rivers, lakes, etc., usually contains various inorganic and organic substances dissolved in it and is not pure water. …

*Some of the terminology that refers to "conductivity water" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…蒸留によらずイオン交換樹脂などを用いて，脱塩精製した水も蒸留水と同じように用いることがあり，日本薬局方では蒸留水とあわせて精製水purified waterとよんでいる。また純粋な水は電気抵抗が高く，溶液の導電率測定に用いることができる程度に精製したもの(電気抵抗1×10⁶Ω･cm以上，通常の蒸留水は10⁵Ω･cm程度)は伝導度水conductivity waterといっている。　水はきわめて多くの物質を溶かすため，普通の水，すなわち水道水，井戸水，雨水，河川･湖沼などの水は，各種の無機物あるいは有機物を溶かしていて，純粋な水ではないのが普通である。…

※「conductivity water」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報