An "effective" form of this quantity used to calculate conductivity in the Drude model is equal to three times the harmonic m
An "effective" form of this quantity used to calculate conductivity in the Drude model is equal to three times the harmonic mean of three similarly-named values specific to each dimension. Its invariant form is proportional to the square root of the difference of the squares of energy and momentum times the speed of light. Some of this quantity is lost when atoms bond, this value's defect. Black holes are completely categorized by charge, angular momentum, and this quantity.  Given by force divided by acceleration, for 10 points, name this measure of an object's inertia, measured in kilograms.
An "effective" form of this quantity used to calculate conductivity in the Drude model is equal to three times the harmonic mean of three similarly-named values specific to each dimension.
mass [accept effective mass before "this value"] 