  We follow the dynamic evolution of a cluster of Ising spins pointing up
surrounded by other spins pointing down, on a lattice. The cluster represents a
liquid drop. Under a microscopic point of view, the short range ferromagnetic
coupling between these spins plays the role of the van der Waals attraction.
Alternatively, under a macroscopic point of view, the same ferromagnetic
coupling gives rise to the surface tension along the drop boundary. This naive
model is applied to the study of different systems, out of thermodynamic
equilibrium. For each such a system, other interaction terms can be included,
for instance an external magnetic field with a downwards uniform gradient,
representing Earth's gravity. Also, for each system, proper dynamic rules and
boundary conditions are adopted. The behaviour of such a drop is monitored as a
function of time, through computer simulations. Many quantities of interest, in
particular those related to drop fragmentation, were measured and the results
were compared with available experimental data. The real systems we have in
mind are exemplified by water drops falling from a leaky faucet, nuclear
multifragmentation, mercury drops falling on the ground, magnetic hysteresis
curves, and interface roughness.
