衡含水率（EMC）： 湿材置于干燥的环境下中，木材的水分会向周围空气中蒸发。在纤维饱和点以下，每当周围相对湿度发生变化，木材细胞壁中吸着水量也相应地变化。若周围空气的温度较低，细胞壁中的水蒸气分压比空气中的大，则水分由木材向空气中蒸发，使得吸着水含量减少，该现象叫解吸。解吸过程初期，木材的水分蒸发很强烈，随后解吸过程渐缓，最后达到动态平衡或稳定，此时的木材含水率叫解吸稳定含水率。

当周围的湿度较高时，细胞壁中的水蒸气的分压比空气中吸湿，使得吸着水含量增大，此现象为吸湿。木材含水率在吸湿过程中达到稳定值叫吸湿稳定含水率。细薄木料在一定的空气状态下，最后达到解吸稳定含水率或吸湿稳定含水率，叫平衡含水率。

-Balance the moisture content (EMC): The wet material is placed in a dry environment, the timber the water will evaporate to the ambient air. Below the fiber saturation point, whenever the ambient relative humidity changes, the adsorption of water in the wood cell wall change. Lower the ambient air temperature, water vapor partial pressure in the cell wall than the air in the large, the evaporation of water from the timber into the air, so to reduce the adsorbed water content, the phenomenon is called desorption. The beginning of the desorption process, the wood moisture evaporation is very strong, followed by the desorption process gradually slowed, and finally a dynamic equilibrium or stability, the wood moisture content at this time called desorption stable moisture content. When the surrounding humidity is high, the cell wall of water vapor partial pressure than air and moisture, making the adsorbed water content increases, this phenomenon moisture. Wood moisture content reaches a s