 So, I am Samin I will be offering gas dynamics it is a study of compressible flow if the density of rate of change of density is due to pressure is appreciable we call that flow compressible flow otherwise incompressible flow gas dynamics is a study of compressible flow we would be looking initial few weeks we will be looking at the thermodynamics which is a prerequisite for the course then we will move on to conservation equations and other phenomena that is associated with compressible flow. In this course there will be at least 10 assignments and best 6 would be taken for the grading 40 percent of the entire course evaluation is based on these assignments and 60 percent from the return test that is going to happen sometime in April or May given in the NPTEL website. We would require something called a gas table which we will write in the course home page where you could look at the publication publisher and buy that book or get those tables from one of the appendices available in the references we have given in the NPTEL course website. So, we will be using those tables to do some numerical problems where we will use the ratio of specific heats 1.4 gamma equals 1.4 gases we will strictly restrict our studies to fluids gases with gamma 1.4 value we this course is assisted by Manjul Sharma and Ashodinayar the emails of us would be given in the discussion forum that is given in the website we would be happy to take any questions that is coming from you welcome to the course.