Hey all, I have a question concerning atmospheric pressure. I understand that there are two ways to look at pressure, at micro scale (kinetic theory) and at macro scale (seeing pressure a a state variable). Now i'd like to understand atmospheric pressure using both perspectives. At micro scale i think it's pretty straightforward. Gravity causes an increase in air density closer to earth. More molecules means more collisions and thus a higher pressure. At macro scale, i have been taught that atmospheric pressure at a point can be seen as the weight of the column of air over that point. My problem arises when you slowly close a vessel and place it on the ground. Intuition tells me the pressure in the vessel will be the same as outside the vessel. Using the kinetic theory this can be explained since the density and temperature are the same inside and outside the vessel. However, i am lost when ik try to use the macro scale perspective to explain the pressure in the vessel, since the weight of the air above is now carried by the walls of the vessel. I've got the feeling i'm missing an important point here, can someone help me? Thanks!