A double-fluid U-tube manometer is attached to an air pipe in which the absolute pressure is 69 kPa. Fluid 1 (SG_{1} = 13.55) is in contact with the air; its surface on the air side is 28 cm above the interface between fluid 1 and fluid 2 in the other arm. Fluid 2 sits above that interface and its free surface, open to the atmosphere, is 40 cm above the interface. Taking P_{atm} = 100 kPa, determine the specific gravity of fluid 2 (dimensionless).