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*<math>T_u</math> is the unburnt mixture temperature.
In typical combustion process, <math>\alpha\approx 0.7-0.9</math>. For [[isobaric process|isobaric]] combustion, using [[ideal gas law]], the parameter can be expressed in terms of [[density]],<ref>Clavin, P. (1985). Dynamic behavior of premixed flame fronts in laminar and turbulent flows. Progress in energy and combustion science, 11(1), 1-59.</ref> i.e.,
:<math>\alpha = \frac{T_b-T_u}{T_b} = \frac{\rho_u-\rho_b}{\rho_u}.</math>
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