What is plasma? Plasma is considered as the fourth state of matter. It does not have any definite shape and volume. Conducts electricity. By heating plasma ionizes. By applying magnetic field plasma deflects
Discovery of Plasma The existence of plasma was first discovered by Sir William Crookes. He used Crookes tube, an experimental electrical discharge tube in which air is ionized by the application of a high voltage through a voltage coil. Sir J.J. Thomson, a British physicist, identified the nature of the matter in 1897. It was not until 1928 that the term “plasma” was coined by Irving Langmuir Sir William Crookes
Properties of Plasma Consist of free moving ions and electrons It can be accelerated and steered by electric and magnetic fields. Stars are predominantly plasma as are most space and astrophysical objects. Energy is needed to strip electrons from atoms to make plasma
Where Plasma exists? Lightning Nebulae Auroras (Northern Lights) Interstellar space The Sun The solar wind Galaxies Flames as plasmas
Applications of Plasma Plasmas are conductive and respond to electric and magnetic fields and can be efficient sources of radiation Recent new discoveries have occurred in understanding extremely cold plasmas which condense to crystalline states, the study of high-intensity laser interactions, new highly-efficient lighting systems, and and help in computer manufacturing In present, there is a research going on plasma medicine. Plasma medicines, experiments confirm that plasma can be effective in in vivo antiseptics without affecting surrounding tissue and, moreover, stimulating tissue regeneration. Industrial and extractive metallurgy surface treatments such as thermal spraying(coating), etching in microelectronics, metal cutting and welding
1. A plasma display panel (PDP) is a type of flat panel display common to large TV displays 30 inches (76 cm) or larger. They are called "plasma" displays because the technology utilizes small cells containing electrically charged ionized gases, or what are in essence chambers more commonly known as fluorescent lamps.