wrote in message . com...

We know the electricity in air it will flash such as lightning .But
when the electricity in vacuum space.Will it flash,too? If it will
flash,And why?
Thanks for you looking.

A fancy terms for flashing or arcing is "dielectric breakdown". If
the voltage gradients in vacuum are steep enough, particles and
anti-particles may be spontaneously pulled out of the void. The
vacuum too can undergo dielectric breakdown. E.g.,

http://arxiv.org/ftp/astro-ph/papers/0105/0105464.pdf

"If the environment is sufficiently clean, the GRB gamma ray burst
fireball could be generated by the vacuum breakdown[15] in the volume
close to the polar cap of the BH black hole. The magnetic field
required to explain the high luminosity of GRB generates an electric
field that could break down the vacuum".

I don't know what field strength this is supposed to occur at. A
brief web search however suggests that as a practical matter what is
called "vacuum breakdown" here on Earth involves not the spontaneous
creation of charged particles in the vacuum itself, but their
emmission from electrodes in vacuum devices, causing arcing over
vacuum at lower voltages than true vacuum breakdown.