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- Homework Statement
- I've been trying to make understand the equation for the relationship between the pressure and elevation within a fluid for some time now, I was wondering if someone could help me out...

I don't understand why the force exerted on the top of the fluid element is (p+dp)A and the bottom is pA? The textbook doesn't really provide any explanation for why this is the case... Why is it not the other way around? Wouldn't there be an additional force at the bottom of the element due to there being more fluid above..?

- Relevant Equations
- dp/dy =-rho g

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