👉 In physics, a rapidity is a numerical value that describes the orientation of an object relative to its rest frame. It's often denoted by q or ψ in quantum mechanics and γ in electromagnetism. Rapidities are crucial for describing the state of motion of particles, such as electrons or photons. They provide information about how a particle is moving through space-time, and can be used to describe the behavior of particles like protons, neutrons, and electrons. The rapidity
