Editing Compressible flow (section)

===Maximum achievable velocity of a gas===
Ultimately, because of the energy conservation law, a gas is limited to a certain maximum velocity based on its energy content. The maximum velocity, ''V''<sub>max</sub>, that a gas can attain is:

:<math>V_\text{max} = \sqrt{2c_p T_t}</math>

where c<sub>p</sub> is the specific heat of the gas and T<sub>t</sub> is the [[stagnation temperature]] of the flow.