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electrical conductivity

By Shirlie Sharpe, About.com

Definition: Electrical conductivity is the measure of total concentration of dissolved salts in water. When salts dissolve in water, they give off electrically charged ions that conduct electricity. The more ions in the water, the greater the electrical conductivity it has.

Because there are almost no ions in distilled water, it has almost no electrical conductivity. Hard water contains more salts, and therefore more ions, has a high electrical conductivity.
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