Clark degree

A unit expressing the hardness of water, primarily used in Great Britain, equal to 1 grain (64.8 milligrams) of calcium carbonate per imperial gallon, equivalent to about 1 part per 70,000 parts of water. Symbol, °Clark. These are sometimes called English degrees (°E), to distinguish them from the German (deutsche häte, °dH) and French degrees (°f).

The unit was named for Hosiah Clark (-1898).

Sorry. No information on contributors is available for this page.

home | units index | search |  contact drawing of envelope |  contributors | 
help | privacy | terms of use