Ultrasound gel, or ultrasonic gel, ultrasound jelly, or gel ultrasonic, is a water-based, non-staining material put on the skin prior to the use of ultrasound procedures. The primary purpose is to serve as a conductive medium that reduces air pockets between the transducer and the skin. Air obstructs the passing of sound waves; the gel allows these waves to flow unimpeded into the bod... https://www.gstc.com/product/ultrasound-gel/