Regarding the issue of pressure gauges measuring pressure differences in containers
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If the gauge reading measures only static pressure, how can we explain the difference in gauge readings before and after a moving heat exchanger (assuming the gauges are at the same height)? In other words, when the liquid is at rest, there is no difference in the readings of the pressure gauge; however, a difference appears when the liquid is flowing. This pressure difference is what we commonly refer to as pressure drop. Could some expert please explain this? Thank you
The dynamic pressure is different in the two places, and so is the static pressure.