Where does air pressure come from?
I thought it was from gravity or the speed of the gas resulting from its heat. However, analyzing my own hypotheses, I think that my 'heat conjecture' is probably incorrect. Gravity seems more likely, as once you go farther away from Earth, the air pressure decreases, as does gravity. So it seems that air pressure results from the air being sucked downward by gravity, even culminating in toxicity at the end of a mine shaft.
Thanks to smart guys from here, I found out why gas particles don't maul us to death from their high velocity. - they don't have enough concentrated energy; instead they apply pressure. So the question is, where does that pressure come from?