Where the mass of a proton comes from
The Higgs field helps give mass to elementary particles such as quarks. But a proton’s mass is not simply the sum of the masses of its quarks. Those quarks are bound together by the strong force, carried by particles called gluons, and the combined system contains far more energy than the quarks’ own masses account for.
Energy becomes inertia
In Einstein’s relation, energy contributes to mass: a system with energy has inertia, meaning it resists being accelerated. Inside a proton, quarks and gluons are constantly interacting, and the energy stored in their motion and in the strong-force field contributes most of the proton’s mass. It is not a little heap of energy sitting inside; it is the energy of the bound, dynamic system.
This is why the Higgs mechanism is not the whole answer to the question of why ordinary objects have mass. It helps set the masses of quarks, but the mass of a proton—and therefore much of the mass of atomic nuclei—emerges mainly from the energy of the strong interactions holding those quarks together.
From protons to everyday weight
Protons and neutrons make up atomic nuclei, so their mass dominates the mass of most familiar matter. Electrons also contribute, but far less. The chair, the ground, and your body are heavy mainly because the particles inside their nuclei are energetic bound systems. In that sense, much of everyday mass is the lasting, measurable inertia of energy confined by the strong force.
