In classical mechanics, mass can be understood as an object's resistance to acceleration or changes in its motion. However, in the context of quantum field theory (QFT), the interpretation of mass is slightly different.
In QFT, mass is not directly associated with resistance to motion in a classical sense. Instead, it arises from interactions between particles and their corresponding quantum fields. The Higgs mechanism, for example, is a fundamental concept in QFT that explains the origin of mass for certain particles.
According to the Higgs mechanism, elementary particles acquire mass through their interactions with the Higgs field, which permeates all of space. The Higgs field is a quantum field that, when excited, gives rise to the Higgs boson. Interactions between particles and the Higgs field generate mass for those particles.
In this framework, the experience of weight or heaviness when we move a body is not solely due to resistance to motion in the quantum field. It is influenced by the gravitational force exerted by the Earth on the object. Weight is a measure of the force of gravity acting on an object's mass, as described by Newton's law of universal gravitation.
So, while mass in QFT is related to the interaction of particles with quantum fields, the sensation of weight we experience is primarily a result of gravity rather than resistance to motion in the quantum field itself.