Examples of diffusion. The concept of flux. Derivation of the general unsteady heat equation in 3-space. Importance of the diffusion coefficient. Boundary conditions related to physical concepts.
Steady solutions are linear with constant heat flux.
Double glazing and piecewise linear solutions. Eigenvalues obtained from boundary conditions. Use of Laplace Transform shown by example. Steady heat flow and Laplace's equation briefly covered. Spherically-symmetric solutions in r and t .