Gently shake the glass, wait for the wine to make a few circles in the glass after stopping, wait for a while, we can see a row of curved or strip of wine slowly slide down the wall, this is “hanging glass”, also known as “wine tears” or “wine legs”.
The phenomenon of hanging cup is related to the tension on the surface of the liquid. The evaporation rate of alcohol is faster than that of water, and the surface tension is smaller than that of water. Under the action of gravity, the hanging cup is formed.
Environmental factors such as temperature and humidity can affect the evaporation rate of alcohol, and then affect the formation of wine tears.
The higher the temperature, the faster the alcohol volatilizes, the easier it is to produce wine tears.
In addition, sugar, glycerin and dry extract can also affect the hanging cup.
The higher the levels of glycerin, alcohol and sugar in a wine, the more likely it is to form a hanging glass when shaken.
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