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:<math>\frac{T_b}{T_u} = \frac{\rho_u}{\rho_b}=\frac{1}{1-\alpha}.</math>
==Gas expansion ratio==
The gas expansion ratio is simply defined by
:<math>r = \frac{\rho_b}{\rho_u}</math>
which is related to <math>\alpha</math> by <math>r=1-\alpha.</math>
==See also==
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