Dimensional analysis and similitude is used to examine the integral characteristics of turbulent diffusion flames, jets in fluidized media, and condensing vapor jets. Data such as flame length,jet penetration length, momentum flux and mass entrainment for these disparate jets are described in a common dimensionless frame. Thus, entrainment in turbulent diffusion flames permits an estimate of the particle entrainment in gas jets in fluidized media. Conversely, since the penetration length of gas jets in fluidized media is affected by the gas to solid density ratio, similitude permits an assessment of flame to ambient density ratio upon turbulent diffusion flame length.