The ratio of the area at the throat to the area at sonic flow, denoted as At/A*, is a key parameter in fluid dynamics that quantifies the change in cross-sectional area as the flow transitions from subsonic to supersonic conditions in a nozzle or flow passage.
- Ratio of area at the throat to the area at the sonic flow (At/A*)
- Ratio of area at the throat to the area at exit (At/Ae)
- Ratio of area at the exit to the area at sonic flow (Ae/A*)