If I have a pipe for which I know the height and velocity of the fluid at the left and right end, and I am asked to find the gauge pressure at the right end, how would I go about doing this if the internal pressure at both ends is unknown to me? I am aware that finding the difference in pressures will give me the correct answer, though I dont necessarily understand why this is the same thing as P(g) = P(abs) - P(atm). It just doesn't intuitively make sense to me. Any explanation would be much appreciated. Thanks!!
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If the right end is open to the atmosphere, then the gauge pressure is zero, and the absolute pressure at the right ends is equal to atmospheric pressure.
answered Dec 28, 2015 at 1:22