During the first five episodes of this series we've discussed explosions of all sizes, where the energy output is successively matched by the ejected mass, the density of the swept-up ambient medium, and finally by the characteristic pressure or stress of this medium, which can be a gas like air, a liquid like water, a solid like soil, or even the near vacuum of interstellar space. The dynamics of explosions are governed by this set of four mechanical parameters: energy, mass, density and stress. We call this set the "explosion domain". In this sixth episode on the physics of explosions we see how the possible pairs of mechanical parameters of the domain lead to six regimes outlining the possible trajectories of explosions in space and time. We see how the four possible trios define systems of objective units, which are much better suited to the description of explosions than the meter and second. Finally, we show that the combination of the four parameters of the domain lead to a dimensionless quantity indexing each explosion and delimiting two qualitatively different categories of explosions: the supersonic detonations and the subsonic deflagrations.