Heat transfer by conduction occurs through which mechanism?

Heat transfer by conduction occurs through which mechanism?

• A. Direct contact between particles
• B. A moving fluid
• C. Electromagnetic radiation only
• D. Magnetic fields

Answer: (A)

Conduction transfers heat through direct contact between particles. When a region becomes hotter, its particles have more energy and collide with neighboring particles, passing some of that energy along. In solids, this happens mainly through lattice vibrations and, in metals, via free electrons that move and spread energy quickly to cooler areas. A moving fluid describes convection, not conduction, while electromagnetic radiation transfers heat via photons, not particle contact. Magnetic fields don’t transport heat in the common sense. So the mechanism described by direct contact between particles best explains conduction.

Conduction transfers heat through direct contact between particles. When a region becomes hotter, its particles have more energy and collide with neighboring particles, passing some of that energy along. In solids, this happens mainly through lattice vibrations and, in metals, via free electrons that move and spread energy quickly to cooler areas. A moving fluid describes convection, not conduction, while electromagnetic radiation transfers heat via photons, not particle contact. Magnetic fields don’t transport heat in the common sense. So the mechanism described by direct contact between particles best explains conduction.