Scientists at Cornell University have made a small electronic chip. It uses electricity to make tiny bubbles of a gas called hydrogen from water. Scientists can choose when and where the bubbles appear. They can also change their size and number. They control one bubble or groups of bubbles.
The team uses sound waves to 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. Scientists can change the bubbles to send liquid in different directions. The system could one day help send medicine to the right place in the body. This is a possible future use.
