What condition describes two parallel edges of a panel being in the same plane while the portions between are out of plane?

Bowing refers to the condition where two parallel edges of a panel are aligned in the same plane, while the middle section of the panel distorts and moves out of that plane. This creates a curve or arc in the panel, which can be visualized as a bowstring, where the ends are taut (the parallel edges) but the middle section bends away. This issue is often related to factors such as moisture content, changes in temperature, or the material's natural properties, which lead to uneven expansion or contraction.

Understanding this term is crucial in contexts like construction or woodworking, as it helps identify issues related to material stability and performance. Recognizing bowing can lead to necessary adjustments in the construction process, ensuring that installations are both aesthetically pleasing and functionally sound.