Pressure Sensors (IMAGE) University of California - Davis Caption These flexible, transparent pressure sensors invented by UC Davis biomedical engineers use a drop of liquid that acts as a variable capacitor. Credit Tingrui Pan, UC Davis. Usage Restrictions May be used with credit. 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.