Materials that are poor conductors of heat and reduce the rate of heat energy conduction are called?

Materials that are poor conductors of heat and reduce the rate of heat energy conduction are called?

• A. Conductors
• B. Insulators
• C. Semiconductors
• D. Radiators

Answer: (B)

Materials that resist heat flow are called insulators. They have low thermal conductivity, so they don’t transfer heat easily. This happens because their structure limits how energy can move—there aren’t many free carriers to carry heat, and when air is trapped in tiny pockets, it further slows energy transfer by convection and vibration (phonon) interactions. That’s why insulators like fiberglass, foam, wood, or plastic are used to keep heat from moving between areas, such as in refrigeration piping or building walls. In contrast, conductors (like many metals) let heat pass through quickly, semiconductors have mid-range conductivity, and radiators are devices designed to emit heat rather than describe a material’s insulating property.

Materials that resist heat flow are called insulators. They have low thermal conductivity, so they don’t transfer heat easily. This happens because their structure limits how energy can move—there aren’t many free carriers to carry heat, and when air is trapped in tiny pockets, it further slows energy transfer by convection and vibration (phonon) interactions. That’s why insulators like fiberglass, foam, wood, or plastic are used to keep heat from moving between areas, such as in refrigeration piping or building walls. In contrast, conductors (like many metals) let heat pass through quickly, semiconductors have mid-range conductivity, and radiators are devices designed to emit heat rather than describe a material’s insulating property.