  A general scaling of the evolution of an exploding liquid jet under an ultra
short and intense X-ray pulse from a X-ray free electron laser (XFEL) is
proposed. A general formulation of the conservation of energy for blasts in
vacuum partially against a deformable object leads to a compact expression that
governs the evolution of the gap produced by the explosion. The theoretical
analysis contemplates two asymptotic stages for small and large times from the
initiation of the blast. A complete dimensional analysis of the problem and an
optimal collapse of experimental data reveal that the universal approximate
analytical solution proposed is in remarkable agreement with experiments.
