Many have asked me to make a summary for the working questions for the gas dynamics. Due to time constrains, this document wasn't constructed. Therefore, I found myself searching for an equation in the book and I realized the importance and the urgency of this document. At this stage, this collection is a ``quick-fix'' which will be improved, hopefully, in the coming days. These equations were collected from the book ``Fundamentals of compressible Flow'' by Genick Bar-Meir and translated by using latex2html versions 1.7.