A pressure gauge reads 50 kPa as water flows at 15.0 m/s through a 16.8-cm-diameter horizontal pipe. What is the reading of a pressure gauge after the pipe has expanded to 20.0 cm in diameter? Express your answer with the appropriate units. p1 = 35.3 kPa. The unit you entered is not recognized. Review a list of acceptable units. No credit lost. Try again.