  We briefly review the key aspect of the QCD instanton vacuum in relation to
the quantum breaking of conformal symmetry and the trace anomaly. We use
Ji$^\prime s$ invariant mass decomposition of the energy momentum tensor
together with the trace anomaly, to discuss the mass budget of the nucleon and
pion in the QCD instanton vacuum. A measure of the gluon condensate in the
nucleon, is a measure of the compressibility of the QCD instanton vacuum as a
dilute topological liquid.
