Be able to solve engineering hydrostatic problems LO1.1Pressure measuring devices: manometers; other instruments (used to measure fluid pressure and pressure differentials) QUESTION 1.1 a) A manometer is used to measure the pressure in a pipe carrying natural gas and the liquid on the manometer has a density of 750kg m-3. The difference in levels is 1200 mm. This measurement can be made to an accuracy of ±1mm. What is the smallest pressure change that can be measured? b) If the manometer liquid were changed for one with ad density of 1,200kgm-3how would this affect the value of the smallest pressure change that could be measured? c) Investigate what instruments would be used to measure the pressure in the water mains