1. The problem statement, all variables and given/known data We have a pipe open at both ends and having the length of 1 meter. After putting it into a tub of Mercury and thus filling it to the half, we close the upper end of it, and then remove it from the tub. What is the height of the residual column of the Mercury in the pipe? pex=105 Pa 2. Relevant equations 3. The attempt at a solution I don't even know where to start, as there is air inside the pipe at the beginning.