If a hot beverage in a cup gets stirred, the sound of the spoon changes. You can easily hear this if you repeatedly cling the spoon to the cup ground after stirring. The cling sound will raise in tune for quite a long time.
This even happens if the fluid motion is (almost) stopped after stirring, eg. by using the spoon to do so.
What is the reason for this effect? Why it last so long after stirring?
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