| This exhibit
is a glass tank containing a salt solution and some special dyes.
On either side of the tank are electrodes that cause electrically
charged particles in the solution, called ions, to move towards
the electrodes, depending on whether they carry a negative or positive
charge. Bubbles can be observed being released on the surface of
the electrodes. The electricity is breaking water apart and releasing
hydrogen and oxygen. The dyes change color depending on whether
the solution is acidic or basic. Near the positively
charged electrode, the liquid becomes acidic and makes the dyes
turn yellow. Near negatively charged electrode, the liquid becomes
basic (or alkaline), so it turns purple. A magnet held on the surface
of the glass near where yellow and purple are mixing causes the
fluid to begin to swirl, because when electrically charged particles
move in a magnetic field, they move in curved paths.