1. The problem statement, all variables and given/known data The assignment is not in english but I'll try to translate it. I hope I've posted it in the right thread. You have a tube which is 48 meters long and one end is closed while the other end is open. You take the tube with the open end first into seawater (1025 kg/m3) and drop it down to 48 meter depth. The atmospheric pressure is 1020 hPa. Do not take into account temperature differences. How high will the water rise inside the tube? 2. Relevant equations Fluid pressure = Density * 9,81 * height Total pressure = Air pressure + Fluid Pressure Pressure * Volume = Pressure * Volume (Constant) 3. The attempt at a solution To find a solution I think I need to find out when the fluid pressure is equal to the pressure inside the tube. And to be honest I'm not sure how to figure this out. I've tried with the different equations but the answer seems way out of line. Hope someone can help me and at the same time try and tell me why it is the way it is since I really want to learn. It's probably an easy question but to me it's difficult.