“Water conducts electricity”

The common belief that water is a good conductor of electricity is a widespread misunderstanding, largely stemming from everyday experiences and safety warnings. While it's true that contact with water and electricity can be extremely dangerous, the water (Review) itself isn't the primary culprit in its pure form. This misconception likely arises because the vast majority of water we encounter in our daily lives, from tap water to ocean water, is far from pure.

Scientifically, pure water, also known as deionized or distilled water, is an electrical insulator, meaning it does not readily conduct electricity. Water molecules (H2O) are polar but do not easily dissociate into ions that can carry an electrical charge. The ability of a substance to conduct electricity hinges on the presence of free-moving charged particles. In pure water, these are largely absent, making it a very poor conductor.

The reason most people correctly associate water with electrical hazards is due to the presence of dissolved impurities. Water is an excellent solvent, and as it travels through the ground, pipes, and even the air, it picks up various salts, minerals, and other substances. These dissolved substances, such as sodium, chloride, calcium, and magnesium ions, are charged particles. It is these ions that provide the necessary pathways for electricity to flow through the water, turning an otherwise insulating liquid into a conductive solution. Our practical experiences with tap water, swimming pools, and natural bodies of water, all of which contain these conductive impurities, reinforce the myth.