The aggregation of particles out of an initially homogeneous situation is well known in physics. Depending on the system under consideration and its control parameters the cluster formation in a supersaturated (metastable or unstable) situation has been observed in nucleation physics as well as in other branches. We investigate the well-known example of condensation (formation of liquid droplets) in an undercooled (water) vapour. The formation of bound states as a stochastic process is related to transportation science. We present a comparative analysis of nucleation to the probabilistic description of traffic congestion.
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