Thermal resistance is a measure of a material's ability to resist the flow of heat. It is an important concept in fields like engineering and building design, where it helps determine how well a material insulates against temperature changes. The higher the thermal resistance, the better the material can keep heat from passing through, which is crucial for energy efficiency in homes and appliances. This property is often expressed in terms of R-value, which quantifies the effectiveness of insulation materials. Different materials, such as fiberglass, foam, and cellulose, have varying R-values, influencing their suitability for specific applications. Understanding thermal resistance helps in selecting the right materials for maintaining comfortable temperatures and reducing energy costs.