Cell Problem experiments are carefully timed procedures that
investigate the behaviour of interacting fluids under pressure,
a controlled liquid explosion permanently captured.
A Hele-Shaw cell can be used to explore a variety of phenomena
that involve surface tension and viscosity simultaneously.
Being two-dimensional the effects are easy to observe, Waves
growing exponentially on an unstable interface, and tear drops
falling slowly down the cell for example.
Hele-shaw cells make beautiful patterns when liquids of different
viscosity are injected in. The cell is made from two flat transparent
plastic plates. One with a hole in the middle through which
liquid can be injected into.