What effect does humidity have on wood?

Humidity significantly affects the physical properties of wood due to its hygroscopic nature, which means that wood can absorb and release moisture from the surrounding environment. When humidity levels increase, wood tends to absorb moisture, causing it to expand or swell. Conversely, when humidity levels drop, wood can lose moisture, leading to shrinkage. This fluctuation in moisture content can cause various issues such as warping, cracking, and checking, which can compromise the structural integrity and aesthetic appeal of the wood. Understanding the impact of humidity is crucial for carpenters and woodworkers, as it affects the performance and longevity of wood in various applications.