A U-tube manometer filled with mercury is connected between two points in a pipeline. If the manometer reading is 30 mmHg, calculate the pressure difference in kPa between the points when: (a) Water is flowing through the pipeline, and (b) Air at atmospheric pressure and 20 °C with a density of 1.20 kg/m³ is flowing in the pipeline. Given: Density of water = 1000 kg/m³ and density of mercury = 13600 kg/m3 %3D

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