Convection in fluid mixtures.

Many of the most striking examples of nonequilibrium pattern formation and chaos have been observed and studied in Rayleigh- Benard convection in pure fluids. These studies have been extended to fluid mixtures, which are particularly interesting because the additional diffusion mode allows for the possibility of two different types of convective threshold, an instability to steady convection as in pure fluids, and an oscillatory instability to a time-periodic state. A small article will appear in Physics News in 1986.