MIT Physics Demo -- Conductivity of Ionized Water
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.
Added 3 years ago | 00:01:24 | 11642 views
Added almost 5 years ago | 00:01:07 | 50108 views
Added over 5 years ago | 00:02:02 | 37501 views
Added over 1 year ago | 00:00:52 | 3951 views
Added over 5 years ago | 00:01:28 | 103338 views
Added 6 years ago | 00:00:23 | 62320 views