  We compare the capacity of entanglement with the entanglement entropy by
considering various aspects of these quantities for free bosonic and fermionic
models in one spatial dimension, both in the continuum and on the lattice.
Substantial differences are observed in the subleading terms of these
entanglement quantifiers when the subsystem is made by two disjoint intervals,
in the massive scalar field and in the fermionic chain. We define $c$-functions
based on the capacity of entanglement similar to the one based on the
entanglement entropy, showing through a numerical analysis that they display a
monotonic behaviour under the renormalisation group flow generated by the mass.
The capacity of entanglement and its related quantities are employed to explore
the symmetry resolution. The temporal evolutions of the capacity of
entanglement and of the corresponding contour function after a global quench
are also discussed.
