hard water

countable uncountable

(chemistry) Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.

Japanese Meaning

（化学）溶存鉱物質、特にカルシウムの濃度が高く、石鹸で泡立ちにくい水

The laundry didn't get clean because the town's hard water prevented the soap from lathering.

町の硬水（溶解ミネラル、特にカルシウムを多く含む水）のため石けんが泡立ちにくく、洗濯物がきれいにならなかった。

Sense（1）

(chemistry) Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.

hard waters

（ plural ）