What is conduction?

What is conduction?

• A. Heat transfer to another body or within a body by direct contact
• B. Heat transfer by circulation within a medium such as a gas or a liquid
• C. Heat transfer by radiation
• D. The process of cooling a hot object with water

Answer: (A)

Conduction is heat transfer through direct contact, where thermal energy moves from a hotter region to a cooler region within a material or between objects that touch. It happens as particles collide and transfer kinetic energy, and in metals, free electrons boost this transfer, making them good conductors. This mechanism does not require the whole substance to move; it can occur in solids, liquids, or gases as long as there’s contact and a temperature difference.

The other described methods refer to different processes: convection involves heat transfer by the circulation of a fluid, radiation is heat transfer through electromagnetic waves without contact, and cooling a hot object with water is a specific cooling method that may involve multiple mechanisms but does not define conduction itself.