critical moisture content

https://doi.org/10.1351/goldbook.15164
A stage in the drying of solids, above which the drying rate (derived from the plot of the loss of moisture content against time) is linear, at which the drying rate ceases to be linear, until it reaches the equilibrium moisture content.
Source:
PAC, 2009, 81, 971. (Glossary of terms related to pharmaceutics (IUPAC Recommendations 2009)) on page 980 [Terms] [Paper]