do you know what a plasma is?
it's any form of gaseous matter in a high energy state, very often so excited that electrons are temporarily dislodged
if an ultrasonic wave can create standing waves in a chamber that by measurements reach upwards of 5000'C then that is a state of powerful excitation
plasmas conduct electricity because of the quantum state of the electrons, this is a big part of the way that stars throw stuff at us, powerful magnetic fields, electrical current and plasma