As we learned in Chapter 4, the equations describing the motion of plasma are three equations that are derived from the laws of conservation of mass, momentum, and energy. These three equations express the four variables that describe the moving plasma – mass density, pressure, temperature (or energy), and velocity – as functions of spatial position and time. Since it is not possible to solve a system of three equations for four variables, we need a fourth equation relating some or all of these four variables that does not introduce another variable. The fourth equation is the equation of state. In the discussion that follows we will refer to the equation of state as the EOS.

With the EOS specified, we can then solve the equations ...

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