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Água conduz eletricidade a 18.000 volts? Tecnicamente, precisamos falar de campo elétrico, não apenas de tensão. A DDP é medida em volts, mas o que determina a ruptura de um dielétrico é o campo elétrico, dado aproximadamente por E = V/d, onde V é a tensão aplicada e d é a distância entre os eletrodos. A água pura é um dielétrico fraco condutor. Sua resistividade é da ordem de 18 MΩ·cm quando ultrapura. Porém, a água comum contém íons dissolvidos, reduzindo drasticamen
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