><span class="o">.</span><span class="n">kilojoule_per_mole</span> <span class="o">/</span> <span class="n">model</span><span class="o">.</span><span class="n">chr_system</span><span class="o">.</span><span class="n">getParticleMass</span><span class="p">(</span><span class="mi">1</span><span class="p">))</span>
    <span class="n">velocs</span> <span class="o">=</span> <span class="n">u</span><span class="o">.</span><span class="n">Quantity</span><span class="p">(</span><span class="mf">1.0</span> <span cl