Definitions

from The Century Dictionary and Cyclopedia

  • n. The process of determining the hardness of a natural water by measuring the volume of a solution of soap of known or standard strength which is curdled by a given volume of the water. Adding the soap solution by small portions in succession, and shaking after each addition, a froth or lather lasting several minutes is produced as soon as the quantity required for curdling has been slightly exceeded.

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