1304 Thermal Conductivity - Insulation Energy Efficiency - The Basics -

Image Text: The thermal conductivity (k) of a HOMOGENEOUS material is equal to the number of BTUs that will pass through one square foot of the material (that is 1 inch thick) over the course of 1 hour (with a 1 degree Fahrenheit temperature difference across the material) > in this case, the thermal conductivity (k) of the concrete slab is 12 > concrete slab > T degrees Fahrenheit > 1 inch thick > T + 1 degree Fahrenheit > 1 square foot > 12 BTUs