How Does The Gas Pump Know When to Shut Off?
Have you ever wondered how a gas pump knows when your gas tank is full? I know I have. You're driving along and your gas light comes on. Annoying, I know. You pull into the nearest gas station and pull up to a dispenser. You swipe your credit card, put the nozzle in, and squeeze the handle. You watch the numbers on the read-out climb and climb when suddenly *click* the handle disengages. Anyone who's pumped gas knows this means your tank is full. You return the nozzle to its