1General properties 2------------------ 3 4| :ref:`gmx energy <gmx energy>`, :ref:`gmx traj <gmx traj>` 5| To analyze some or all *energies* and other properties, such as *total 6 pressure*, *pressure tensor*, *density*, *box-volume* and *box-sizes*, 7 use the program :ref:`gmx energy <gmx energy>`. A choice can be made from a 8 list a set of energies, like potential, kinetic or total energy, or 9 individual contributions, like Lennard-Jones or dihedral energies. 10 11The *center-of-mass velocity*, defined as 12 13.. math:: {\bf v}_{com} = {1 \over M} \sum_{i=1}^N m_i {\bf v}_i 14 :label: eqncomvelocity 15 16with :math:`M = \sum_{i=1}^N m_i` the total mass of the system, can be 17monitored in time by the program :ref:`gmx traj <gmx traj>` ``-com -ov``. It is however 18recommended to remove the center-of-mass velocity every step (see 19chapter :ref:`algorithms`)! 20