its the branch but i cannot understand it
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Plasma physics is the study of plasma. Plasma is another phase of matter that is very similar to gas. When gas is heated up to a really high temperature, eventually the molecular bonds in the gas will all break. Also, the atoms will all be ionized as the electrons and protons disassociate! This is the fundamental property of plasma physics: a large cloud of electrons and a large cloud of protons. Because the electrons are free to move so easily, plasmas react to electric fields very easily, nearly as one entity.
The reason why plasma physics is so important is that, even though it's not very common on Earth naturally (neon signs and those fluorescent light tubes use plasma!), the main phase of matter in the universe is plasma! All the stars are so hot that they are made of plasma.
I hope this helps you understand the field of plasma physics!
tl;dr: Plasma is the stuff in the stars. Look up.
The reason why plasma physics is so important is that, even though it's not very common on Earth naturally (neon signs and those fluorescent light tubes use plasma!), the main phase of matter in the universe is plasma! All the stars are so hot that they are made of plasma.
I hope this helps you understand the field of plasma physics!
tl;dr: Plasma is the stuff in the stars. Look up.