Which materials are known to transfer heat faster?

• A. Water and metal
• B. Wood and plastic
• C. Air and glass
• D. Paper and fabric

Answer: (A)

Heat transfer speed depends on thermal conductivity—the ability of a material to conduct heat. Materials with high thermal conductivity transfer heat quickly. Metals are the classic high-conductivity materials because free electrons move energy rapidly through the substance, speeding up conduction. Water also conducts heat relatively well compared with common insulating materials, and it can transfer heat efficiently through both conduction and convection when there is movement. In the given options, metals and water stand out as the pair capable of transferring heat faster than the others, which are mainly insulators (wood, plastic, paper, fabric) or poor conductors (air, glass). So the combination of a metal and water best reflects faster heat transfer among the choices.