An arrangement for applying droplets of a substance in liquid form to a surface. The arrangement includes a chamber which is divided into an outer chamber portion and an inner chamber portion with a channel connecting the outer and inner chamber portions. The inner chamber portion is provided with a device which produces short duration pressure increases in the fluid in the chamber. The outer chamber portion is provided with at least one intake channel for the supply of liquid from a supply container and a discharge channel through which the liquid is discharged for deposition on the surface. The discharge channel and the connecting channel are arranged so that they are axially aligned.