  Dense star clusters expand until their sizes are limited by the tidal field
of their host galaxy. During this expansion phase the member stars evolve and
lose mass. We show that for clusters with short initial relaxation time scales
(<~100 Myr) the dynamical expansion is largely powered by mass loss from stars
in the core, but happens on a relaxation time scale. That is, the energy
release following stellar mass loss is in balance with the amount of energy
that is transported outward by two-body relaxation.
