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The dielectric properties of a material dictate the ability of any material to "conduct" after a sufficient electric potential or "voltage" is applied. The atmospheric air becomes "conductive" during a lightning and provides a passage for electrons to pass through. The liquid used as the coolant could have had a low dielectric constant as a compromise towards its increased thermal conductivity. Also, crystallization does not typically increase the conductivity of a solution. In fact, crystallization often occurs when the solute in a solution forms solid crystals, which reduces the concentration of ions or charged particles in the solution. Conductivity in a solution is a measure of its ability to carry an electric current, and it depends on the concentration of ions or charged particles present in the solution. When a solute crystallizes, the ions or charged particles come together and form a solid crystal lattice, which reduces their mobility and decreases the concentration of charged species available to conduct electricity.