$$ f(v_x,v_y,v_z)\,dv_xdv_ydv_z=\left(\frac{m}{2\pi k T}\right)^{3/2}e^{-m(v_x^2+v_y^2+v_z^2)/2kT}\,dv_xdv_ydv_z $$
$$ f(v)\,dv=4\pi v^2 \left(\frac{m}{2\pi k T}\right)^{3/2}e^{-mv^2/2kT}\,dv $$
$4/\sqrt{\pi}u^2e^{-u^2}$의 그래프