In this lab we measure the burning speed of different fuels. We measure burning speed by running some experiments in a constant volume spherical vessel. As we get pressure data we enter it as the input to a computer code developed in our group to measure the burning spped. By this method burning speeds can be measured at high temperatures and pressures. In addition, we study the behavior of premixed flames by a shadowgraph optical system to observe the propagation of flame in more detais. This shadowgraph system consists of a high speed CMOS camera, optical mirrors, light source and a cylindrical constant volume vessel.