Why does water get stuck in your ears after you swim?

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Why does water get stuck in your ears after you swim?

In: Physics

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There’s a thing, called surface tension. With that you can carefully overfill a glass with water. Even when the glass is full you can add water and it bends above. The water molecules at the surface are a bit like velcro. The smaller the opening is the higher the effect. Your ear is a small tube like a blind alley. The water builds a dense surface like a cork in a wine bottle. If you can touch that surface with a finger the water runs out of your ear.