Abstract
The Boltzmann equation is the basis of gasdynamics. If the mean free path is much smaller than macroscopic gradient lengths, then the well known hydrodynamic equations, i.e. the continuity equation (2.1.5), the momentum equation (2.2.43) with P = P k , the energy equation (2.3.26) with P = P k , q = q k and additional constitutive equations for P k , e and q k , can be derived from the Boltzmann equation.
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