Oil and water don’t mix, and the mass density of oil is smaller than that of water. suppose water is poured into a u-shaped tube that is open at both ends until the water surface is halfway up each leg of the tube, and then some oil is poured on top of the water in the right leg. once the system comes to equilibrium, are the top of the oil column in the right leg and the top of the water column in the left leg at the same height? if not, which is higher?
the right leg (oil on top) is higher
the left leg (no oil) is higher
the two legs are the same height