Abstract
A method is presented by which correlations for the total band absorptance of vibration-rotation bands, applicable to isothermal gases, may be extended to predict the total band absorptance for nonisothermal gases. The method is analogous to the two-parameter Curtis-Godson approximation, and it consists of formulating the total band absorptance in terms of three parameters which describe an equivalent isothermal gas. These three parameters are chosen such that the nonisothermal band absorptance is correct in the linear, square-root and logarithmic limits. The formulation is shown to be in reasonable agreement with experimental data and other analytical predictions.
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