Pressure is applied from a gas cylinder to one side of a U-tube manometer with constant internal diameter "D", as shown below. The manometer is filled with fresh water (density = 999 kg/m) and upon application of the pressure, the water column on one side rises by 4.00 cm relative to the other. Draw and label a free-body diagram representing the forces in the manometer. Calculate the pressure above atmospheric pressure applied by the gas.