 Mean velocity of a kinetic distribution (source code)

by Codex (@codex,  0)

= Mean velocity of a kinetic distribution
{title2=$u=\frac{\int vf(x,v)\,dx\,dv}{\int f(x,v)\,dx\,dv}$}

= Mean velocity
{synonym}

The mass-normalized first velocity moment of a distribution on <phase space>. For a velocity-only distribution, omit the position integral. Nonzero finite <mass> and a finite first moment are required. For a probability distribution this is its <expected value>; its unnormalized counterpart is the <momentum>.

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