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In continuation of the video on vibration of air columns and after deducing the equation of motion of the particles of the gas we are going to talk about finding the possible normal modes of longitudinal vibrations of the column of a gas under two specified boundary conditions. We will discuss the normal mode frequencies and the shapes in two cases. The first one we consider is the case of a tube closed at its one end and open at the other. In the second case we will discuss the normal modes in a tube which is open at its both ends. The tube open at one end is also called open organ pipe and that open at both ends as open organ pipe. The tube closed at one end has only odd harmonics of the frequencies 3,5,7,…times the fundamental frequency. On the other hand it is found that all even and odd harmonics are present in case of the tube open at both ends.