十万个为什么·科学启蒙30篇（4）
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Why Ears Feel Muffled After Swimming
为什么游泳时耳朵会进水发闷
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Water can enter the ear canal easily when you dive or submerge your head underwater.
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Unlike air, water doesn’t compress, so it blocks sound waves from reaching the eardrum.
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This trapped water makes sounds seem distant, hollow, or muffled to the listener.
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The ear canal’s shape and narrow opening sometimes prevent water from draining out quickly.
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Tiny hairs and wax inside the canal may trap water even more effectively.
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Shaking your head or tilting it helps gravity drain some of the water away.
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Using warm air from a hairdryer on low setting can gently evaporate remaining moisture.
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If water stays too long, it may cause swimmer’s ear — an outer ear infection.
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Earplugs designed for swimming help prevent water entry altogether.
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The ear’s natural design works well in air but faces challenges in water.