1. The problem statement, all variables and given/known data A tank is filled with 50 cm of oil (SG 0.8) overlaying 50 cm of water (SG 1.0). A pipe leads away at an angle from the bottom of the tank. If 2.13 m of the pipe is filled with water, what is the angle the pipe makes with the horizontal? 2. Relevant equations I missed class, so off the top of my head or in my book I can't see anything pertaining right away. 3. The attempt at a solution I researched and saw SG was specific gravity. I was out sick from class the day these things were went over, so I honestly just need help getting the problem kick-started. I don't know how S.G. has to do with finding an angle or anything. Any nudge in the right direction would be great, thank you.