Hi, we are doing an experiment and encountered the following problem We have two cylindrical tubes connected together and the two tubes have different diameters (laying horizonally on the table, for example). So if we put water into the tubes and apply the same pressure to the two water surfaces (each with the same diameter as the two tubes, ie. one is smaller than the other). Will the water start flowing in the tubes this case? If so, which direction will it flow?