This is a 14 slide PowerPoint presenation on the behaviors of gases. It provides examples of gases, information on temperature, volume, and pressure, as well as a description of Boyle's and Charles's Law. The presenation includes links to videos, as well as a couple simple demonstrations. The last 2 slides are review questions.
I use this PowerPoint with my 8th grade physical science students. We can complete it in one 45 minute class period.