Final answer:
The effectiveness of insulation is measured by the R factor, which is the ratio of material thickness to thermal conductivity. Higher R values indicate better insulation. Thicker materials, such as fiberglass batts, provide more insulation than thinner ones.
Step-by-step explanation:
The thickness of an insulating material plays a crucial role in its effectiveness. A thicker insulating material provides better thermal resistance, slowing down heat conduction. This is particularly important for energy conservation in buildings and appliances. Insulating materials are characterized by their R factor, which is the ratio of the material's thickness (d) to its thermal conductivity (k). For example, a material with a high R value, such as fiberglass batts with an R factor of 11 or 19 for thicknesses of 3.5 and 6.5 inches respectively, would be superior insulation compared to one with a lower R value. The R value is essential in cold climates where maintaining warmth with minimal energy loss is key.