A dropping vessel (100) comprises a cylinder (1) comprising a chamber (11) intended to contain a liquid to be dispensed drop by drop by a nozzle (12) connected to the chamber (11)； wherein the said dropping vessel (100) comprises a lower closing element (2), an upper closing element (4), and spring means (5) disposed between the upper closing element (4) and the lower closing element (2) to generate a vibration every time the upper closing element (4) moves with respect to the lower closing element (2) to dispense a drop of liquid.
