The expression that gives a physical quantity that is a measure of the inertia of a body is its mass.
The expression that gives a physical quantity which is a measure of the inertia of a body is the mass of the body. Inertia is the tendency of an object to resist changes in its state of motion, and mass quantifies this property of an object. The greater the mass of an object, the more inertia it possesses. The expression for measuring inertia is given by the mass of the body.
