Sample Jet Nozzle (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption In the gas dynamic virtual nozzle, liquid flows through a internal capillary, issuing some distance from the opening in the outer tube through which the gas flows. Approaching the narrow opening, gas pressure and speed increase, focusing the thin stream of liquid until it is so small only a single protein or virus can fit into each droplet. Credit courtesy John Spence, ASU Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.