ELI5, How does air pressure affect things inside an airplane or submarine if they are completely enclosed? how can the air particles inside the shell know what the pressure is outside?

Question

ELI5, How does air pressure affect things inside an airplane or submarine if they are completely enclosed? how can the air particles inside the shell know what the pressure is outside?

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Answer 1

Airliners aren’t pressurized to sea level, it’s usually 5-6,000 feet in the cabin. You still get the sensation of ascending.

Sea level pressurization would take way more energy.