Researchers at Cornell University made a small chip that creates tiny bubbles. The bubbles contain a gas called hydrogen. The team uses electricity to make them from water. Researchers can choose when and where bubbles appear. They can also change their size and number.
Sound waves make the bubbles shake. This moves the liquid around them. The sound waves must have the right frequency for the bubbles to vibrate strongly and move the liquid. The team can change the direction of the liquid by changing the bubbles and their places.
This system could help send medicine to a chosen place. For now, this is a possible future use.
