Content: This is not a lesson plan. It is a tool that quickly solves for all variables in gas, density, and heat equations. I once had a text where 30% of the answers in the key were incorrect. I struggled all year trying to weed them out and spent the summer developing a solutions manual. Then a few years later I had to do it all over. In grading labs, I often had to redo calculations to determine if it was the data or the calculations that were wrong. Finally, at times I found I needed more problems for tests or class work. This tool addresses these problems. Doing this takes a lot of time and anyone who thinks teachers have time on their hands hasn’t been a teacher.