Task: Text Categorization
Input (English): This quantity is multiplied by the speed of light in the denominator of the Compton wavelength. The difference of this quantity's unbound and measured quantities is its "defect. " The implied asymptotic increase of this property with speed makes faster-than-light travel impossible. In general relativity, the presence of this property causes spacetime to curve. The Higgs boson might impart this property to matter. Einstein equated it with energy and the speed of light squared. For 10 points, name this quantity which, when multiplied by acceleration, gives force.
Output (English): Science