The PG & Research Department of Physics (Shift II), Sacred Heart College organized the third invited special lecture on 14^th December, 2022. The event began with a note of welcome by Dr. M. Jose, PG Head, Department of Physics followed by the introduction of the Resource Person by Dr. Ramesh, Assistant Professor. Dr. K.P.J Reddy, Chairman, MACHSTAR Group, Inventor of Reddy Tube, Emeritus Professor, Indian Institute of Science, Bangalore was the resource person. He gave the presidential address and he pointed out that research is not just going through the space and all we need to observe the small things around us in our routine life and get motivated to do useful research to the society is the real application of the knowledge.  The invited speaker Dr. S. Srinath, Director, Technology ZIWWIT Educational & Research Centre, Thanjavur has delivered a talk on ‘Gas - Wave Dynamics- Recent Research and Its Applications’. The speaker gave an introduction to the propagation of gas waves as linear waves and nonlinear waves in a fluid medium. Also he explained the drag reduction technique used in the study of telescopic aero spike used as an alternative for the missile and rockets. He explained about: the thermo acoustic concept and its application in designing of the TASHE engine followed by Large Carbon Cluster (LCC) by a single step pyrolysis technique. Dr. Martin Britto Dhas, Assistant Professor and Mr. Mariya Joseph, PG Secretary honored the speaker with a memento. About 57 PG students, 15 research forum students of Shift-II and few research scholars participated in this invited talk and got benefitted.