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March 21st 04, 08:33 PM
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John Woodgate wrote in message ...
I read in sci.electronics.design that Jeff Liebermann wrote (in mppp50ho4dr08ahkb3dlbqkcfkp0ih ) about 'CB Radios, Cellphones and Gasoline Vapor Ignition', on Sun, 21 Mar 2004: The gap necessary to create an arc with 22 volts is: 22V / 20,000V/in = 0.001 inches Kinda small, but given a microscope, a 1 mil spark gap will arc. But it takes about 350 V to do so. The relationship between voltage and gap length is very non-linear below about 500 V. In fact the Paschen curve - breakdown voltage plotted against gap - has a minimum at around a couple of hundred volts, and the breakdown voltage starts rising again for very small gaps. The linear right-hand branch of the graph where you might see a slope of 20,000V per inch doesn't extend down to 22V. The theory explaining the conductivity of electricity through gases was worked out around the turn of the last century, and doesn't seem to be all that well known any more. Pity. ------- Bill Sloman, Nijmegen |
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