There are three states of matter according to our experience of the world – solid, liquid and gas. Solid, most dense state turns to liquid and liquid to gas on heating, but what happens when we heat gas too? It turns into plasma, which is also called the fourth state of matter. What is Plasma – The Fourth State of Matter Plasma is simply an ionic form of gases which contains ions and free electrons. Its existence was first identified by Sir William Crookes in 1879 as the fourth state of matter and later, in 1928, Irving Langmuir introduced the…