The key to making this work is to choose a condiment-packet diver that barely floats. This works because, while many sauces are denser than water, it’s actually the air bubble sealed inside the packet that determines whether it will sink or swim.
Squeezing the bottle increases pressure on the condiment packet, compressing the air bubble inside. When the higher pressure compresses the air in the packet, the packet displaces less water, thus decreasing its buoyancy and causing it to sink. When you release the sides of the bottle, the pressure decreases and the air inside the packet expands once again. The packet’s buoyancy increases and the diver rises.
Each Tuesday is EducationTuesday here at Adafruit! Be sure to check out our posts about educators and all things STEM. Adafruit supports our educators and loves to spread the good word about educational STEM innovations!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.