  Molecular dynamics simulations with separate thermostats for rotational and
translational motions were used to study the effects of these degrees of
freedom on the structure of water at a fixed density. To describe water
molecules, we used the SPC/E model. The results indicate that an increase of
the rotational temperature, $T_\textrm{R}$, causes a significant breaking of
the hydrogen bonds. This is not the case, at least not to such an extent, when
the translational temperature, $T_\textrm{T}$, is raised. The probability of
finding an empty spherical cavity (no water molecule present) of a given size,
strongly decreases with an increase of $T_\textrm{R}$, but this only marginally
affects the free energy of the hydrophobe insertion. The excess internal energy
increases proportionally with an increase of $T_\textrm{R}$, while an increase
of $T_\textrm{T}$ yields a much smaller effect at high temperatures. The
diffusion coefficient of water exhibits a non-monotonous behaviour with an
increase of the rotational temperature.
