When passing through the tunnel, "The ear is tun" why does it happen?How to deal with airplanes and elevators

When the train enters the tunnel, the ears may feel clogged or hurt.Why does that symptom occur?Also, how do you deal with it?

The pressure goes down all at once!

When the train enters the tunnel, when you take off the plane, when you get up and down by elevator, or cross the pass by car, your ears may be "tone".

This is due to the change in pressure, and a pressure difference is generated at the eardrum of the ear, which gives a "tone" symptom that is applied to the eardrum.

When the train enters the tunnel at high speed, the air in the tunnel is first compressed, and the eardrum is pushed inside.After that, a speed difference between the airflow occurs between the tunnel and the vehicle, and the pressure inside the car decreases (the image of the air is sucked out), so that the eardrum is pulled out.

Similarly, the eardrum is pushed or pulled, even if a sudden change in pressure caused by a sudden altitude change, such as when you ride an airplane or an elevator.

In order to eliminate this discomfort, some people may unconsciously swallow the saliva.Actually, the nasal cavity (the space behind the nose) and the back of the ear are connected by a tube called "Eustachian tube", and it is usually closed, but it opens by swallowing saliva ("bot".You can hear the sound).As a result, the back of the ears is transmitted to the outside air, and the eardrum returns to the original state.

[Image] Express difference 240m!I measured the air pressure that suddenly decreases in the tunnel

[Ainu Culture and Hidaka Line] It was amazing when I got off at Shirao Station, a limited express station!