Chapter 16 Kinetic Theory of Gases 1 Velocities based on statistics Statistical Hypotheses(统计假设 (a) Velocities of molecules are different. Each molecule has its velocity, which may be changed due to collisions (b) At equilibrium, the distribution of molecules on the position is uniform, which means that the density of number of molecules is the same everywhereChapter 16 Kinetic Theory of Gases 1 Velocities based on statistics: Statistical Hypotheses(统计假设): (a) Velocities of molecules are different. Each molecule has its velocity, which may be changed due to collisions; (b) At equilibrium, the distribution of molecules on the position is uniform, which means that the density of number of molecules is the same everywhere