Ear popping - also called ear clearing - is any of various maneuvers to equalize the pressure in the middle ear with the outside pressure, by letting air enter along the Eustachian tubes, as this does not always happen automatically when the pressure in the middle ear is lower than the outside pressure.
This need can arise in scuba diving, skydiving, fast descent in an aircraft, and being put into pressure in a caisson or similar pressure-bearing structure, or sometimes even simply travelling at fast speeds in an automobile. When that happens, learn how to fix it.
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