What IS Pressure-- in a pipe? Whaddup, guys! Sorry to bug you with another question. So, I learned that Pressure = Force / Area. Pretty easy stuff. Water will exert a certain amount of force per area depending on how deep the object is submerged. But... what about in a pipe? There's Bernoulli's Equation, P + .5ρv2 + ρgh = P + .5ρv2 + ρgh, which can be used to find pressure changes in a pipe with different flow rates (the typical hourglass-shaped pipe comes to mind). So, question: But what is this "pressure" in this pipe? If pressure is force over area, where does the water exert this force? Like, exactly where? Does it exert it outwards against the pipe walls, or does it exert it... upon itself? What? That my instructor managed to skip over this thing bugs me a bit. Is it not important?