Question

i'm trying to work out a problem referring to a pressurised (solid) cylinder. it this cylinder has a liquid, or agent inside and is then pressurised with nitrogen. The nitrogen will saturate into this liquid and the process is repeated until the required pressure is achieved. From observation, the liquid level will increase when nitrogen is added and as a result, the calculated mass will increase. But if the mass of the liquid is 10kg for talking sake and i add 1kg of nitrogen, why is the measured mass not 11kg, It turns out to be 13 kg (for argument sake) where is this extra 2kg increase in mass coming from?

Is it because of the increase in liquid level? (also, what is happening here)

What is an effective way of measuring the mass after pressurisation that is accurate?

Is it possible to calculate the mass without knowing the mass of nitrogen added, only the liquid level change and the pressure?

For more information, the cylinder has a dome on top and bottom. I'm not looking for specific answers i need to know how to proceed with this problem and some insight along with a point in the right direction to solve this problem.  

Answer 1