The ratio of density behind the wave to the density ahead of the wave is a measure of the change in density that occurs when a fluid flows across a wave, such as a shock wave or an expansion wave. The density ratio is defined as the ratio of the density behind the wave (ρ2) to the density ahead of the wave (ρ1). The density ratio depends on the type, strength, and orientation of the wave, as well as the properties and speed of the fluid.
- Ratio of density behind the wave to the density ahead of the wave (ρ2/ρ1)
- Specific heat ratio (𝛾)