Definitions for "EXPANSION RATIO"
Keywords:  exit, undried, diameter, volume, ratio
The ratio of gas volume after expansion to the gas volume before expansion.
Ratio of burned gas volume to initial volume for a low-speed (constant pressure) flame. Expansion is responsible for flame-induced flow.
The ratio of the area of the exit diameter of the exhaust portion of a nozzle to the area of the throat - determines Cf (thrust coefficient).