In common parlance, mass is weight, but in science, mass is a measurement of an object's inertia, or resistance to acceleration. It can also be described as the degree to which an object bends space-time around it, according to the Theory of Relativity. One of the unsolved mysteries of physics is the origin of the rest-masses of the various particles. This origin is believed to be related to the Higgs boson, which was discovered by the LHC at CERN to have a mass of around 126 GeV in 2012.
The scientific measure of weight, is:
where is the acceleration due to gravity