For ease of reference the solubility of official articles is indicated in approximate terms in accordance with the following equivalents:

Substances that are soluble in less than

1 part of solvent = very soluble.

From 1 to 10 parts of solvent = freely soluble.

From 10 to 100 parts of solvent = soluble.

From 100 to 1,000 parts of solvent = slightly soluble.

From 1,000 to 10,000 parts of solvent = very slightly soluble.

From 10,000 to 100,000 parts of solvent = nearly insoluble.

More than 100.000 parts of solvent = practically insoluble.