In natural units, this quantity's square is the difference between the squares of energy and momentum.
In natural units, this quantity's square is the difference between the squares of energy and momentum. Units of this physical property include "electronvolts over c squared" and "daltons." Objects with this property have (*) inertia and can interact with each other via gravity. This property is equal to force divided by acceleration. For 10 points, name this property that is divided by volume to find density, and that is often measured in grams.
In natural units, this quantity's square is the difference between the squares of energy and momentum.
mass (accept inertial mass until "inertia" is read; accept gravitational mass until "gravity" is read; prompt on "inertial" or "gravitational" mass after they are read, accept Planck mass; do not accept or prompt on "weight")