A light bulb is placed in series with two copper plates immersed in de-ionized water. Touching the plates closes the circuit, lighting the bulb.
When kosher salt is dropped into the de-ionized water, the salt dissolves, causing ions to be dispersed throughout the liquid. The free ions allow current to flow through the water, which completes the circuit and lights the bulb.
Most water we encounter in everyday life is not de-ionized and contains impurities with dissolved ions. This is why we know water as a good conductor, and why we shouldn't use electronic devices around a bathtub, for example.
See original video on MIT TechTV - http://techtv.mit.edu/file/1105/
Equal stripes from an aluminium and an iron drink can are held into the flame of a micro spirit burner.
Plastic is burning.
Aluminium has to be dropped first due to its heat.
URL: www.micrecol.de/sinusmic4b.html
One ice cube is placed on a wood board, a second one on a black sheet of aluminium. Both bases are black and have the same shape. On Al the ice melts much quicker because Al has an excellent heat conductivity
At room temperature the ice on the aluminium sheet melts much quicker than the one on wood.
Ein Eiswürfel liegt auf einem glatten schwarzen Brett, ein zweiter auf einer glatten schwarzen Aluminiumplatte gleicher Größe. Auf Al schmilzt das Eis viel schneller. Dieses Metall leitet nämlich Wärme besonders gut.
At room temperature the ice on the aluminium sheet melts much quicker the the one on wood
