I saw a video the other day explaining air pressure where a teacher breaks a ruler by hitting it over a table underneath a sheet of newspaper. I get generally how that works. But then she said atmospheric pressure is 14 psi and so the whole sheet has 7000lb of pressure on it. That’s BS right? Like it clearly doesn’t have 7000 lbs pressed against it? Isn’t that the weight of the column of air above it?
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It’s not bull shit. It’s the weight of the fluid that is the atmosphere pressing down evenly across a surface.
With the example of breaking the ruler, *additional* pressure is being added on top of the atmospheric pressure, and it’d being added unevenly causing structure changes – the ruler breaking
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