A material that doesn't allow heat to flow through it easily is called a heat insulator.

A material that doesn't allow heat to flow through it easily is called a heat insulator.

• A. Heat Insulator
• B. Electrical Conductor
• C. Thermal Conductor
• D. Heat Engine

Answer: (A)

Heat transfer happens in ways like conduction, convection, and radiation, and some materials resist that transfer. A material that doesn’t let heat flow through easily is called a heat insulator because it has low thermal conductivity and slows down heat exchange. The correct choice matches this idea exactly, reinforcing that insulators are used to keep heat from passing through. The other options describe things that don’t describe blocking heat: an electrical conductor carries electricity (not heat), a thermal conductor allows heat to pass through (the opposite of an insulator), and a heat engine is a machine that uses heat to do work rather than describe a material’s ability to block heat.

Heat transfer happens in ways like conduction, convection, and radiation, and some materials resist that transfer. A material that doesn’t let heat flow through easily is called a heat insulator because it has low thermal conductivity and slows down heat exchange. The correct choice matches this idea exactly, reinforcing that insulators are used to keep heat from passing through. The other options describe things that don’t describe blocking heat: an electrical conductor carries electricity (not heat), a thermal conductor allows heat to pass through (the opposite of an insulator), and a heat engine is a machine that uses heat to do work rather than describe a material’s ability to block heat.