The two-fluid U- tube manometer is being used to measure the difference in pressure at two points in a line containing air at 1 atm abs pressure. R-0 =0 for equal pressures. the lighter fluid is a hydrocarbon with a density of 812 kg/m^3. and the heavier water has a density of 998 kg/m^3. the inside diameters of U tube reservoir are 3.2mm and 54.2mm respectivly. R = 117.2mm. calculate the pressure difference in mmHg and pascal?