It should also be noted that the theory of the Reynolds stress is quite analogous to the kinetic theory of gases, and indeed the stress tensor in a fluid at a point may be seen to be the ensemble average of the stress due to the thermal velocities of molecules at a given point in a fluid.
22.
In most fission reactor designs, the nuclear fuel is not sufficiently refined to be able to absorb enough fast neutrons to carry on the fission chain reaction, due to the lower cross section for higher-energy neutrons, so a neutron moderator must be introduced to slow the fast neutrons down to thermal velocities to permit sufficient absorption.
23.
2 \ pi \ sin \ vartheta d \ vartheta is the element of the solid angle with its relative value 2 \ pi \ sin \ vartheta d \ vartheta / 4 \ pi, \ vartheta is the angle between perpendicular to the probe surface recalled from the point O and the radius-vector of the electron thermal velocity \ vec { v } forming a spherical layer of thickness dv in velocity space, and f ( v ) is the electron distribution function normalized to unity
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