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SLF here, a trick that works for me when one ear is blocked (usually the case), is to pinch the nose, and the unblocked ear with a finger and then ''blow''.
Dimitris,
That's the valsalva. Plugging your ear, however, won't make a difference, as there's no air passage through the ear, to block with your fingers. You can plug your nose and pressurize your sinus cavities and the eustachian tubes by "blowing," but plugging your ears shouldn't make any difference.
Correct - wont make any difference to the equalising of air pressure - but plugging or sealing the UNBLOCKED ear will protect the eardrum of that ear from overpressure caused by the Valsalva maneouver being used
