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The dielectric field strength of air is 4 to 30 kV/cm.
So a voltage of less than 4 kV is not enough to cause a spark to jump a 1 cm air gap.
A voltage over 30 kV is plenty to cause a spark to jump a 1 cm air gap.
Within that range, pointy conductors allow a spark to form at lower voltage than smoothly rounded conductors.
Different gases and gas pressures also have an effect on the exact voltage required to produce a spark.
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When do you estimate?
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Jump has one syllable.
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