Abstract: A liquid transport device has a chamber, an inlet and an outlet for supplying liquid to and from the chamber through one-way valves, and a bubble forming system for film boiling the liquid to form a precisely controlled film bubble which expands and contracts within the liquid. The expansion and contraction motion of the bubble acts as a pressure source for expelling liquid from the chamber during bubble expansion and withdrawing liquid into the chamber during bubble contraction. Pulses of heat energy are applied to the liquid to form the film bubbles, either by pulse driving an electric heating element with power pulses or by irradiating the liquid with laser beam pulses.