If we had a flow in an open vertical pipe kept in atmosphere so that external pressure is equal at both ends and if we try to apply Bernoulli's equation to it would stand to reason that due to pipe being vertical, potential energy is smaller at the lower end so, kinetic energy must be bigger, which is sensible because gravity did positive work and increased fluid's kinetic energy. But, if pipe's diameter is the same on both ends how can we agree this with continuity principle? From this principle, velocity should have been the same. Is Bernoulli's continuity equation applicable here in its simplest form? Although I am not quite sure what is missing here?