Pure water is an almost perfect insulator.
Yes, water found in nature conducts electricity – but that's because of the impurities therein, which dissolve into free ions that allow an electric current to flow. Pure water only becomes"metallic" – electronically conductive – at extremely high pressures, beyond our current abilities to produce in a lab.
By bringing pure water into contact with an electron-sharing alkali metal – in this case an alloy of sodium and potassium – free-moving charged particles can be added, turning water metallic. "You can see the phase transition to metallic water with the naked eye!" physicist Robert Seidel from Helmholtz-Zentrum Berlin für Materialien und Energie in Germany"The silvery sodium-potassium droplet covers itself with a golden glow, which is very impressive."
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