Physical volume refers to the amount of three-dimensional space that an object occupies. It is typically measured in units such as liters, cubic meters, or gallons. Understanding physical volume is essential in various fields, including science, engineering, and everyday life, as it helps in determining how much space an object will take up. To calculate the physical volume of regular shapes, formulas can be used. For example, the volume of a cube can be found using the formula V = a^3 , where a is the length of a side. For irregular shapes, methods like water displacement can be employed to measure their volume accurately.