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This article maybe considered a supplement of the paper by Chakrabarti and Ghoshal4) titled "Group Theoretic Approach to Similarity Solutions of Chemical Boundary Layer" which appeared in this Journal recently. The stretching invariance employed by them was restricted to reactions of other than first order. In the present article, the author shows that the problem with first-order reaction across a rapidly moving interface is reduced to a heat conduction equation to which the invariance by infinitesimal transformations developed by Bluman and Cole2) can be applied directly. Twoexamples are given, one of which is a new solution and the other a different approach to an established solution.

Some similarity solutions for reaction accompanying mass transfer across rapidly moving interface.