Temperature profiles are calculated through three walls in series with a contact resistance (selected with a slider) between each pair of walls. Heat is generated at a constant rate in either wall A or B (selected with the dropdown menu), and a slider selects the rate of heat generation. The left side of wall A is insulated, and heat is transferred from the right side of wall C to the flowing air, which is at 20°C. The distance between the walls is exaggerated so that the temperature profile is more easily seen.