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Formula from Chapter 9: definition of rms particle speed
\(u_{\mathrm{rms}} = \sqrt{\dfrac{{u_{\mathrm{1}}}^{2} + {u_{\mathrm{2}}}^{2} + {u_{\mathrm{3}}}^{2} + {u_{\mathrm{4}}}^{2} \cdot ...}{n}}\)