Dima Ioffe and Senya Shlosman Ising model fog drip: the first two droplets (370K, pdf) ABSTRACT. We present here a simple model describing coexistence of solid and vapour phases. The two phases are separated by an interface. We show that when the concentration of supersaturated vapour reaches the dew-point, the droplet of solid is created spontaneously on the interface, adding to it a monolayer of a visible size.