The degree of ionization is the measure of the proportion of how many atoms in the gas have lost an electron. Plasma’s characteristics can vary based on what percentage of the gas has become ionized. If the partially ionized gas or "plasma gas
" has an extremely low plasma density (number of free electrons per unit volume) then the substance will still behave like a gas. Even when the degree of ionization is only 1%, the substance will develop new characteristics such as a high conductivity and magnetic field responses. In the field of plasma technology
, machines called plasma generators
create plasma that is usually only partially ionized, but the degree of ionization can be modified to create the desired characteristics. Since even weak ionized gases behave like plasma, the term "plasma gas
" is not really relevant. There is no distinction of what degree of ionization is required in a gas to be referred to as plasma. Any partially ionized gas is referred to as plasma; hence the term “plasma gas
" is not necessary.