The liquid content of a dried substance varies from product to product. Occa- sionally the product contains no liquid and is called bore-dry. More commonly, the product does contain some liquid. Dried table salt, for example, contains about 0.5%water, dried coal about 4%; and dried casein about 8%.Drying is a relative term and means merely that there is a reduction in liquid content from an initial value to some acceptable final value.