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Question 3: A simple U-tube manometer is shown in Figure 2. One end of the U-tube is connected to the pipe A so that the pressure at A (PA) is to be measured. The other end is left to be open to the atmosphere. The U-tube contains a liquid (mercury with specific gravity slig-13.54) called the gage fluid, which does not mix with the fluid (water). If the reading of inside pipe A

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