Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025
Definition
Plasma is a state of matter consisting of a hot, ionized gas with equal numbers of positive ions and free electrons. It is the most common state of matter in the universe, making up stars including our Sun.
AP course connection
Topic 16.1: 16.1 Sources of Sunshine: Thermal and Gravitational Energy
A region around a magnetic material or moving electric charge within which magnetic forces are exerted; crucial in shaping solar phenomena involving plasma.