입체 (Volume) refers to the amount of three-dimensional space occupied by an object. It is a fundamental concept in geometry and is measured in cubic units, such as cubic centimeters (cm³) or cubic meters (m³). Different shapes have specific formulas to calculate their volume, such as cubes, cylinders, and spheres. Understanding volume is essential in various fields, including science, engineering, and everyday life. For example, knowing the volume of a container helps determine how much liquid it can hold. Additionally, volume plays a crucial role in activities like cooking, where precise measurements are necessary for recipes.