The plasma state (the fourth state of matter and the most diffused in the Universe) is characterized by the absence of molecular
bond (for biatomic gases such as Nitrogen and Hydrogen) and/or atomic bond (for mono atomic gases such as Argon and Helium). 
Fig. 1 - Plasma State - Principle of Formation
By supplying Energy (HEAT ENERGY) to a biatomic gas, its molecule
breaks into atoms (molecular Dissociation) and atoms, by further energy, break into one or more positive charges (atomic Ionization).
Hence the plasma state is an ionized gas, formed by positive ions and negative electrons of the gas initially in neutral condition and is a very
good conductor of electricity and is affected by magnetic fields.
Fig. 2 - Ions and Electrons in a Plasma
The Fig. 2 shows a plasma where the positively charged ions (blue) are separated from the negatively charged electrons (yellow).
In a controlled thermonuclear fusion research, plasmas are heated to over 100
million Celsius degrees, while the industrial PTA torches reach plasma temperatures over 10,000 Kelvin degrees.
