Complex sentence: Particles in solids, for example, actually collide or scatter with the crystal lattice (or phonons), which slows them down.Drift Velocity is non-uniform as it involes electric field as an externally accelerating agent.
Split into simpler sentences: Particles in solids, for example, actually collide or scatter with the crystal lattice (or phonons), which slows them down. Drift velocity is non-uniform as it involes electric field as an externally accelerating agent.