Volume Definition Volume is the measure of the region covered by the 3-D solids. In other words, volume is defined as the capacity of a closed surface in three-dimensional space. The unit of volume is cubic units. The volume of various figures is used for various purposes. Volume formulas also have real-life applications, such as finding the volume of containers, the volume of the water tank, and others. Volumes Formulas for Various Shapes Formulas used to calculate the volume of various ... Learn more about Volume - Definition , Unit, and Volume formula for Different Shapes at Embibe. Practice with questions and solved examples. Learn what volume is and how to calculate it for different 3-dimensional shapes using formulas and examples. Explore interactive games and worksheets on volume for math vocabulary and practice. Volume is the measure of the capacity or space occupied by a 3-dimensional object or shape. Learn how to calculate the volume of different shapes like cubes, cylinders, cones, spheres, etc. using formulas and examples.