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

Equal and opposite reaction.

The particles inside just know they have to provide equal force in the opposite direction as the particles outside.

Math that children are unlikely to understand is heavily involved.

Questions like this are why algebra, trigonometry, comics, matrices, calculus, and physics exist.

Someone actually endeavored to figure it out.