The Dialectric Strength for air is 3,000,000 V/per meter =>3000 V/ mm
What this means is that two electrodes placed 1 mm apart will arc at 3000V .
or at 3 million volts if 1 meter apart.
(@ 1 ATM)
[Plasma balls ](http://The Southwest Research Institute defines plasma as “a hot ionized gas containing roughly equal quantities of positively charged ions and negatively charged electrons.” Plasma is considered a fourth state of matter that’s different from solids, liquids, and gases. A plasma ball — also sometimes called a plasma globe, lamp, dome, or sphere — is a clear glass ball filled with a mixture of noble gases with a high-voltage electrode at its center. Plasma filaments extend from the electrode to the glass when electricity is supplied, creating fascinating beams of colored light. The plasma ball was invented by Nikola Tesla when he was experimenting with high-frequency electric currents in a glass vacuum tube. That’s why the electrode at the center of a plasma ball is also often known as a Tesla coil. The modern plasma balls popular as novelty and educational items today were first designed by Bill Parker. The electrode at the center of a plasma ball emits a high-frequency, high-voltage alternating electric current. This current flows through the plasma filaments to create colorful tendrils of light. The colors depend upon the gases used inside the plasma ball. Common gases include neon, argon, xenon, and krypton.)are another phenomenon.