The temporal and spatial distributions of the mass velocities for an explosion of a given source are presented. Experiments show that, for explosions in bulk powdery media, the relative efficiency of sources of equal explosion energy is determined by the temperature of the products. The authors consider how including the PETN equivalent obtained for explosions in bulk soils reflects on the results of explosions of various chemical explosives in other media. The experiments showed that the mass velocities of sand compressed by an external pressure of 200 atm at normalized distances from the explosion center and at normalized times are higher for mixed charges than for PETN charges. The mass velocities of the sand in these explosions were the same if the mixed charges were assigned an energy 1.54 times greater than the actual value.