The piston shown weighs 8 lbf. In its initial position, the piston is restrained from moving towards the bottom of the cylinder by means of the metal stop. Assuming there is neither friction nor leakage between piston and cylinder, what volume of oil (SG = 0.85) would have to be added to the 1 in. tube to cause the piston to rise 1 in. from its initial position?

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1 in (ID) tube 6 in Piston Oil (SG = 0.85) 4 in 4 in Stop 4 in (ID) cylinder