mil是千分之一寸是0.0254mm,1KV=1000volt所以530volt/mil=0.530KV/mil=0.530除以0.0254等于20.866KV/mm,近似于20.9KV/mm.
volts/mil为伏特每毫寸,kV/mm为千伏特每毫米。
1mil=0.0254mm,1volts=0.001kV,
故1volts/mil=0.001kV/0.0254mm=0.03937kV/mm
1kV/mm=1/0.03937volts/mil=25.40volts/mil