1) [18] A U-tube manometer of a reasonable size can have a height difference between the two arms of no more than 1.5 m. What is the maximum pressure difference that you can measure with this manometer (a) if the manometer fluid is water (density 1000 kg/m3) (b) if the manometer fluid is mercury (density 13,500 kg/m3)? (c) What limits the minimum pressure difference that you can measure with a water manometer, and what is the approximate value of the minimum measureable pressure difference