  The nuclear binding energy is studied using a finite temperature density
functional theory. A Skyrme interaction is used in this work. Volume, surface,
and symmetry energy contributions to the binding energy are investigated. The
case of neutron skin is considered in detail. The neutron skin modifies the
mass $A$ dependence of various terms and $I$ dependence of the skin thickness
is proportional to $I$ for the case of same central density.
