An unknown immiscible liquid seeps into the bottom of an open oil tank. Some measurements indicate that the depth of the unknown liquid is \(1.5 \mathrm{~m}\) and the depth of the oil (specific weight \(=8.5 \mathrm{kN} / \mathrm{m}^{3}\) ) floating on top is \(5.0 \mathrm{~m}\). A pressure gage connected to the bottom of the tank reads \(65 \mathrm{kPa}\). What is the specific gravity of the unknown liquid?