Which of the following is a true statement?
A. Flow pressure is the pressure at a discharge opening while water is flowing
B. Atmospheric pressure is the pressure remaining at the source while water is flowing
C. Static pressure is the weight of air surrounding us and at sea level is 14.7 psi
D. Residual pressure is the pressure of water when motionless or no hindering forces are affecting it as long as it is not moving
Answer: A. Flow pressure is the pressure at a discharge opening while water is flowing
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