Wine legs is a term for the physical phenomenon that is observed during the tasting of the wine from a proper wine glass. When you tilt a glass of wine and then return it to its original position on the wall of a glass appear "colorless wine legs" sliding back toward the bottom. The explanation for this phenomenon was given by the British physicist James Thomson and it is called the Marangoni effect. According to this explanation, wine legs occur as a result of interaction between adhesion, evaporation and surface tension of alcohol and water. This means that the wine legs will be thicker and will slide slower if there is a higher alcohol content (and sugar) in the wine. So, wine legs are not an indicator of the quality of the wine, but an indicator of the alcohol content in wine.
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