Q: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
When they are threaded by magnetic fields, they can exhibit waves that propagate in the direction of the field known as Alfven waves, while their characteristics are frequently measured with a Langmuir probe. The kinematic behavior of these entities, which exhibit a collisionless power transfer known as Landau damping, is governed by the Vlasov equation, and a fluid model of processes in them is known as magnetohydrodynamics. They do not allow the propagation of waves below their namesake frequency, and the characteristic shielding parameter in them is known as the Debye length. Often contained in tokamaks, FTP, identify this state of matter consisting of an ionized gas.
A:
Science