Electrical conductivity comparison. A solution conducts electric current when it contains charged particles (ions). A circuit consisting of a battery, two electrodes (copper and graphite) in a jar, and a light bulb is used to test electrical conductivity of different solutions. When the jar is filled with water, the bulb does not light up (left frame) because pure water is a very poor conductor. When table salt (sodium chloride, NaCl) is added to water, the bulb lights up (right frame). Table salt dissociates into Na+ and Cl- ions that carry electric charges in the solution. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Science Source / Turtle Rock Scientific |
Taille de l’image : | 5800 px × 4356 px |
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