What is Whirlpool? How Is It Created?

For the longest time, I have wondered why you get a “whirlpool” effect when you stir a cup of tea, coffee or whatever you enjoy best. You know - you get it moving with a spoon, and when you take the spoon out, the surface of the water is tilted in towards the center. As it slows down, the angle of tilt gets narrower until finally your drink is flat and calm again. Though I’ve never sat down and really worked on it, I’ve thought about it several times and never come to a satisfactory conclusion more here http://logicalscience.com/2017/12/what-is-whirlpool-how-is-it-created/

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