Plasmas explained — Science Learning Hub

We happily live in the Earth’s gaseous lower atmosphere composed of a mixture of gases – primarily nitrogen and oxygen. However, if we move upwards from the Earth’s surface, the environment changes and no longer fits this description. At about 80 km above the Earth’s surface, the atmosphere is no longer made up of gas. Instead, it is made up of ionised gas, which consists of a balanced mix of electrons, positive ions and neutral particles. This state is called plasma. Commonly known as the ‘fourth state of matter’, in the opinion of many astrophysicists, it is the very ‘first’ state since it was the first to form immediately after the Big Bang.

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Plasmas explained — Science Learning Hub