It’s a multi-factor issue. First off is all the twists and turns and folds in the ear canal which channel sound from a wide range down to the ear drum. Combine that with the high surface tension of water, gets the water to bridge the canal on the way out. As soon as this happens, there’s now an air bubble trapped behind it that creates a vacuum as the water tries to drop down, and the canal is small enough that air pressure can’t overcome the surface tension of the water. The key to drawing your ears of water is to slowly tilt your head around and bounce.
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