system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When you're standing up you have 14.7PSI of atmosphere (weight of the air above you) pressing down on all the surfaces perpendicular to this force; shoulders, top of head. Lay down and you expose much more surface area to this force. How does a scale not reflect this change in surface area?
gpt
>When you're standing up you have 14.7PSI of atmosphere (weight of the air above you) pressing down on all the surfaces perpendicular to this force

That's not quite right.  You have 14.7 psi pressing on *all* surfaces -- the top of your head, the bottom of your feet, your stomach back and sides -- at the same time.  It's not a directional "from the top" pressure.