A substance maintaining a fixed form and occupying a constant amount of space is characterized by a specific arrangement of its constituent particles. These particles are tightly packed and held together by strong intermolecular forces, restricting their movement to vibrations around fixed positions. A common example of this is ice, where water molecules are locked in a crystalline structure, giving it rigidity and a constant size.
The characteristic of maintaining both shape and volume is crucial in various applications, from construction materials and engineering components to the fundamental building blocks of biological structures. Its predictability and reliability in retaining dimensions under normal conditions are essential for stability and functionality. Historically, understanding this characteristic has been fundamental to advancements in material science and manufacturing processes.