1. The problem statement, all variables and given/known data A u-tube of uniform cross section with vertical limbs of height 20cm has mercury of relative density 13.6 in the bottom of it. The columns of mercury in each limb are 6.9cm high. Water is poured into one limb until it just reaches the top. Find the height of the water column. 2. Relevant equations P = [itex]\rho[/itex]gh 3. The attempt at a solution Please find attached. Please excuse the massive x. I got angry.