The thermodynamic and mixing characteristics of a family of inlet area ratio 26 ejectors have been measured across a range of primary reservoir pressures (0 to 80 psig) and temperatures (65 to 1000 degrees F). The length-to-duct diameter ratio of the ejectors was the family parameter and varied from 12.36 to 3.46. The distribution of pressure along the wall of the mixing duct clearly identified up to three distinct modes of turbulent mixing. They also substantiated prior observations that mixing is accelerated by heating the primary jet. The discrete modes of mixing were subjectively related to the acoustic properties of the greatly underexpanded primary nozzle.