A flowrate of lubricant oil is \(5 \mathrm{~kg} / \mathrm{s}\) passing through a Venturi tube. The ratio of areas of the Venturi tube is \(0.005 \mathrm{~m}^{2} /0.002 \mathrm{~m}^{2}\). The density of the oil is \(850 \mathrm{kgm}^{-3}\). Calculate the difference of static pressure/head measured by the Venturi.