Plasma is a state of matter containing positive ions, neutral particles & negatively charged electrons.
It was identified by Irving langmuire .in 1928.
Some 99% of the known universe is made of plasma.
Plasma occurs in nature as well as can be prepared artificially.
Þ Natural plasma exists only at very high temperature i.e. around 20,000 OC.
It occur as flames ,auroras and fluorescent light and neon sign.
Þ Artificial plasma can be created by using electrical charge on a gas like neon sign.
Plasma is the good conductor of electricity.
It has a unique fascinating and complex state of matter.
The number of electrons & cations are equal in number in plasma.
Therefore overall we can say it is neutral.
The word plasma was given by Irving Iangmuir.
Examples are (1) Neon Sign (2) Flame of fire (3) Stars
Fluorescent of light bulb is glowing plasma.
In Neon Sign, there is plasma inside the tube. The colour depends on the nature of the gas.
Plasma can be used for generation of electrical energy.
They derive laser and particles accelerator and help to clean up the environment.
It helps in working of computers and electronic equipments.