Question

some people feel their ear popping at the top of mountain
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Answer 1

Answer:

At the top of a mountain, some people feel their ears 'popping' due to the decrease in air pressure. The ears pop in order to balance the difference in pressures outside and inside of the body.

Answer 2

Answer:

People feel their ear popping at top due to exchange or decrease in pressure .

Explanation:

As pressure changes from top to bottom or at heights value of oxygen in air also varies so they also feels problem while breathing

Hope that it may helpfull.....

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