In this paper we propose a new level set approach to describe not only a flame's surface but also to the flame's spatial distribution. First. we derived the mathematical formulation for a one-dimensional laminar premixed flame. where the steady flame has a finite thickness depending on the diffusion flux whose physical quantity such as temperature has a relation to index fun... https://www.roneverhart.com/Ryukyu-Kobujutsu-Buki-Jutsu-Vol-2-DVD-with-Kiyoshi-Yogi/