Question

why are liquid is not as good conductor of electric current as metal

Answer 1

The conductivity of a liquid depends on the presence of ions in it .therefore pure water is an bad conductor and tap water is an good conductor

Answer 2

Water is a better conductor of electricity than ice. Water contains very few ions which are responsible for conduction of electricity. So, if you have few ions, the conductivity will be very poor. Hence on an “absolute” scale, the conductivity of water is very poor. Now, when you make ice, the ions are not as free to move about as in liquid, so the conductivity goes down. It also goes down because the number of ions is reduced at lower temperature. So, all in all, both ice and water are poor conductors of electricity, but liquid water is a better conductor than ice. But, this is true only of “pure” water.

Water that we encounter on a daily basis, even bottled water, is not really “pure” water. It contains many salts, which ionizes in water to form free ions. Those free ions can easily move around in liquid water and it acts as a good conductor of electricity. But, when we freeze that water, those ions can no longer move about as freely, so it becomes a poor conductor of electricity.

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