Phase transition in plasma of electric discharge between parallel plates in air

In high intensity electric discharge in air at atmospheric pressure between parallel plates, during their mutual distance gradually decreasing, there was a plasma compression going on by recombination pressure of decaying peripheral zone of plasma. When the distance between the electrodes was small, there was observed a decrease of pressure and an increase of the cohesive forces in central plasma of the discharge, this being interpreted as a phase transition in plasma —its condensation.In the end I would like to express my thanks to Prof. Dr. S. Veis for his introduction into the problematics of the dense non-ideal plasma.