Why is it that after pouring a delicious beer from a bottle, I can hold it upside down for several seconds without reward, but if I wait a bit, the remainder presumably settles at the bottom and immediately pours out on demand?
Answer
This is very simply down to surface tension - a very small amount of beer (in a relatively thin film) will adhere strongly to a glass as the percentage of bonds between the water and the glass is high.
As the drop size increases (up to a point) more and more of the bonds are internal increasing the strength of the drop and decreasing the adhesion to the glass.
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