Bubble Inside a Bubble

A bubble can exist inside another bubble. Ask students to predict what will happen. Blow one bubble on tray, then carefully blow a second inside it. Key idea: Soap films are flexible membranes whose pressure depends on curvature. Ask: Why don't the two bubbles instantly merge? Safety and cleanup: Teacher or individual clean straws; no sharing. https://www.google.com/search?q=%22Bubble+Inside+a+Bubble%22+science+demonstration+experiment