When a thin film of liquid is evaporating, regular hexagonal convection cells are visible with an infrared camera. As the film becomes thinner and thinner, the liquid becomes stable again and these cells vanish. This critical height was measured and compared favorably with theories taking into account the effect of evaporation. More information can be found at http://bit.ly/2ayNX6d .
An evaporating droplet as seen with the infrared camera. Marangoni convection cells can be seen near the droplet edges.