Water condensation on powered up tesla coils

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mercurus by way of Terry Fritz <twftesla-at-qwest-dot-net>" <mercurus2000-at-cox-dot-net>

Hey, I heard and seen from people that on some larger tesla coils water
begins to condensate on the outside of the coil after being ran for a
while, even when the air is dry, does anyone know why this happens? I think
I remember hearing tesla say something about this, but I can't remember for
sure.