What is the term for the total amount of space within a three-dimensional object?

The term that describes the total amount of space within a three-dimensional object is "volume." Volume measures how much three-dimensional space an object occupies. It is often expressed in cubic units, such as cubic centimeters (cm³), cubic meters (m³), or liters, depending on the context.

For example, when calculating the volume of a rectangular prism, you would multiply its length, width, and height. This helps illustrate how volume quantifies space in three dimensions, distinguishing it from area, which measures two-dimensional surfaces, and perimeter, which measures the distance around a two-dimensional shape. Dimension, while related, refers to the number of dimensions an object has rather than the space it occupies. Thus, volume accurately represents the concept of space contained within three-dimensional objects.