Learning with Lyrics! on Instagram: "How does this mechanism even work? 廊 Let's find out! A gas pump knows when to stop thanks to the Venturi effect and a mechanical shutoff mechanism inside the nozzle. As the tank fills, rising fuel eventually covers a small hole in the nozzle tip, blocking air intake. This creates a change in air pressure, which triggers a vacuum-activated valve inside the nozzle to close and stop the fuel flow! #physics #science #engineering #car #cars"