Spreading, as a physical phenomenon, refers to the time-dependent expansion of a material or disturbance over a spatial domain driven by underlying transport or interaction mechanisms. It can arise from diffusion, advection, capillarity, wave dispersion, or reaction–diffusion dynamics, among others, and is often characterized quantitatively by spreading rates, front velocities, or scaling laws for the growth of a characteristic length scale with time. Spreading phenomena are studied via continuum models, stochastic processes, or kinetic theories to understand pattern formation, stability of fronts, and the propagation of signals, particles, or phases in systems ranging from fluids and plasmas to soft matter and ecological or epidemiological fields.
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