A U-tube manometer is connected to a water supply pipe in order to monitor the pressure in the line as shown in Figure P4.50. If the manometer fluid is mercury (S.G. = 13.6) and the readings are as...

A U-tube manometer is connected to a water supply pipe in order to monitor the pressure in the line as shown in Figure P4.50. If the manometer fluid is mercury (S.G. = 13.6) and the readings are as shown in the figure, what is the pressure difference in the line between points A and B?