What is convection?

What is convection?

• A. Heat is transferred from one place to another along a liquid or vapor transfer path
• B. Heat is transferred by conduction
• C. Heat is transferred by radiation
• D. Heat is stored in a solid without transfer

Answer: (A)

Convection is heat transfer that happens through the movement of a fluid. When air or water is heated, it becomes less dense and rises, while cooler fluid moves in to take its place, creating a circulating flow that carries energy from warmer to cooler areas. In HVAC, this is how warm air from a heater or boiler distributes through a space, either naturally or with a fan moving the air. The other options describe conduction (heat transfer by direct contact through a solid or stationary fluid) and radiation (heat transfer by electromagnetic waves without needing a medium), or simply storing heat without transfer. So the description of heat moving along a liquid or vapor path due to fluid motion best matches convection.

Convection is heat transfer that happens through the movement of a fluid. When air or water is heated, it becomes less dense and rises, while cooler fluid moves in to take its place, creating a circulating flow that carries energy from warmer to cooler areas. In HVAC, this is how warm air from a heater or boiler distributes through a space, either naturally or with a fan moving the air. The other options describe conduction (heat transfer by direct contact through a solid or stationary fluid) and radiation (heat transfer by electromagnetic waves without needing a medium), or simply storing heat without transfer. So the description of heat moving along a liquid or vapor path due to fluid motion best matches convection.