First of all, how can atmospheric pressure be same in a closed room when it clearly depend on the height of the air column. Compared to atmosphere, the room few metres high so how can air pressure be same.
Secondly, how can human body sustain such high pressure. If a body gets hits by a truck on all side with the same pressure, he will be crushed. Even if internal pressure is equal why would not the skin get crushed. Why aren't everyday crushed.
Thirdly, if book is held on a table with few mm of separation, will the air pressure underneath the book be same and how. Will the there be air flow.
What happens to air pressure between small gaps between objects