Chuffing is one of the low-frequency instabilities in solid propellant rockets functioning at low chamber pressures. In chuffing, the rocket motor experiences brief spurts of combustion and consequent pressure buildup, followed by periods of near ambient pressures in the combustion chamber. This period of dormancy can extend up to a few seconds. According to many earlier workers,1-3 during the low-pressure induction period, slow reactions take place in a subsurface layer of the propellant which eventually reaches the temperature where a thermal explosion can occur. Rapid burning of this preheated layer is followed by a sudden ceasing of propellant combustion as the layers beneath it, being at low temperature, cannot sustain the process. While this theory projects the condensed phase reactions as solely responsible for chuffing, there are also those which bring in the importance of gas phase processes.