Hygroscopicity: Moisture and Wood

woodinsite.com: "Strength and stiffness properties of wood products generally increase with drying below the fibre saturation point. Wood shrinks as the moisture content (MC) is reduced below the fibre saturation point, which is the specific moisture content where the wood cell walls are fully saturated but there is no free water in the cell cavities. Drying below this fibre saturation point then removes water from the cell walls and cell wall shrinkage results in changes in member width and thickness. The fibre saturation point varies with species and is typically assumed to be around 24%."