This article is about physical object; for meaning from audio field, see loudness.

The volume of an object is a measure of the amount of space occupied by that object, and is not to be confused with mass. The volume of a mountain is much larger than the volume of a rock, for instance.

By convention, the word volume implies a three-dimensional context where:

• The length is the longest distance between the object's extremities.
• The width (or breadth) refers to the size of the object in a direction perpendicular to its length.
• The height (or depth) stands for the size of that object in the direction perpendicular to both the length and the width.