1. This document summarizes key concepts about gases from Chapter 5 of Zumdahl's chemistry textbook, including gas laws like Boyle's, Charles', and Avogadro's law, as well as concepts like pressure, the ideal gas law, kinetic molecular theory, and the makeup of the atmosphere. 2. It introduces tools for measuring gas properties such as barometers, manometers, and describes gas behavior using the kinetic molecular theory and concepts like effusion and diffusion. 3. It also discusses how real gases deviate from ideal behavior and the van der Waals equation that accounts for intermolecular forces between particles.