19-1 What Is Physics?19-2 Avogadro’s Number19-3 Ideal Gases19-4 Pressure, Temperature, and RMS Speed19-5 Translational Kinetic Energy19-6 Mean Free Path19-7 The Distribution of Molecular Speeds19-8 The Molar Specific Heats of an Ideal Gas19-9 Degrees of Freedom and Molar Specific Heats19-10 A Hint of Quantum Theory19-11 The Adiabatic Expansion of an Ideal GasReview & SummaryQuestionsProblems