Notes that the rigorous kinetic theory, based on the Boltzmann equation, does not yield exact results although some texts claim this to be so. Stresses that they should be presented as approximations with an indication that refinements in the values are possible. (MVL)

Current chemical engineering textbooks teach that the driving force for diffusive mass transport in ideal solutions is the gradient in mole fraction. This is only true for ideal solution liquids. Therefore, it is shown that the appropriate driving force for use with ideal gases is the gradient in partial pressure. (JN)

Presents an overhead projector demonstration that uses the idea of color fading to demonstrate reaction kinetics and diffusion controlled reaction kinetics. (JRH)

Directions for the construction of this apparatus are presented. Materials and procedures for its use are discussed. The behavior of particles in the apparatus is described. (CW)