I was making some hot chocolate and mixing the mug quite thoroughly, and noticed that the pitch of my spoon knocking against the mug changed according with how fast I was stirring. The pitch was deeper while stirring and moving higher as the liquid slowed and stopped moving in the mug.
In: 7
I notice this when making coffee and hot chocolate, most frothy drinks that have a lot of air to be honest. If you hit the Spoon on the base of the mug (inside) it will thud low pitch and the more you hit the higher the pitch gets. I would guess its a something to do with the bubbles in the liquid dampening the sound, or restricting the vibrations through the ceramic. More taps, less bubbles, higher pitch.
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