Which term is the relative ability of a material to transfer heat?

Which term is the relative ability of a material to transfer heat?

• A. Table gauge
• B. Thermal expansion
• C. Surface Graining
• D. Thermal conductivity

Answer: (D)

Thermal conductivity is the measure of how easily heat can flow through a material when there is a temperature difference. It’s a material property, usually denoted k, with units of watts per meter-kelvin (W/m·K). A higher conductivity means heat moves through the material more readily—metals like copper transfer heat quickly—while materials with low conductivity, such as wood or plastic, act as insulators and slow heat transfer. This idea is about how effectively heat travels through a substance, not about how its size changes with temperature (that’s thermal expansion) or surface texture (surface graining). The term is not related to a table gauge, either.

Thermal conductivity is the measure of how easily heat can flow through a material when there is a temperature difference. It’s a material property, usually denoted k, with units of watts per meter-kelvin (W/m·K). A higher conductivity means heat moves through the material more readily—metals like copper transfer heat quickly—while materials with low conductivity, such as wood or plastic, act as insulators and slow heat transfer. This idea is about how effectively heat travels through a substance, not about how its size changes with temperature (that’s thermal expansion) or surface texture (surface graining). The term is not related to a table gauge, either.