A Plasma is a partially or fully ionized gas, where ionization and recombination are balanced to keep the ionized gas to be charge-neutral as a whole. If the charged neutrality is broken, a large electric field maybe locally created to drive plasma unstable. In this sense, charge neutrality (quasi-charge neutrality) is an essential ingredient of plasmas. Plasma, being a collection of charged particles, respond strongly and collectively to electromagnetic fields through long-range Coulomb interaction. |
