Define to Scum…

Action of calcium or magnesium ions which react with hard water and soap to form a curdled white precipitate with soap known as scum.

Mean by Scum…

Action of calcium or magnesium ions which react with hard water and soap to form a curdled white precipitate with soap called scum.

Scum…

Action of calcium or magnesium ions which react with hard water and soap to form a curdled white precipitate with soap called scum.