I’ve created a separate category for blogs about Aya’s experiments (see “Experiments” – what a no-brainer, eh?). Last week we performed a so-called “bottle tornado,” where we created a water vortex using two PET bottles.
For this experiment, we used the following: 2 PET bottles, one make-shift washer (just one of the caps for the PET bottle, with a hole bored through it), tape, and some food coloring.
The principle is simple – water is held in the top bottle by the air pressure in the lower bottle, and the surface tension of the water in the “washer.” Spinning the bottle creates a turning force in the water that breaks the surface tension, allowing the water to flow. The air in the lower bottle is then forced into the top.
Till next experiment!