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# 11.5.1.1: The Star Conditions

The speed of sound at the critical condition can also be a good reference velocity. The speed of sound at that velocity is

$c^{*} = \sqrt{k\,R\,T^{*}} \label{shock:eq:starSpeedSound} \tag{26}$

In the same manner, an additional Mach number can be defined as

$M^{*} = \dfrac{U }{ c^{*}} \label{shock:eq:starMach} \tag{27}$

### Contributors

• Dr. Genick Bar-Meir. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or later or Potto license.