Convection is defined as what?

Convection is defined as what?

• A. Transfer of heat energy within a solid
• B. Transfer of heat energy from a fluid to a solid
• C. Transmission of energy as electromagnetic waves
• D. Transfer of heat energy through a vacuum

Answer: (B)

Convection is heat transfer by the bulk movement of a fluid. When a gas or liquid flows, it carries thermal energy with it and can pass that energy to or from a solid surface at the boundary. That is the scenario described by the choice: heat energy moving from the fluid to a solid. This distinguishes convection from conduction (heat moving within a solid or between solids in contact) and radiation (energy transfer by electromagnetic waves, which can occur through a vacuum). In practical terms, think of hot air or smoke moving past a surface and transferring heat to that surface—the fluid motion is doing the work of moving the heat.

Convection is heat transfer by the bulk movement of a fluid. When a gas or liquid flows, it carries thermal energy with it and can pass that energy to or from a solid surface at the boundary. That is the scenario described by the choice: heat energy moving from the fluid to a solid. This distinguishes convection from conduction (heat moving within a solid or between solids in contact) and radiation (energy transfer by electromagnetic waves, which can occur through a vacuum). In practical terms, think of hot air or smoke moving past a surface and transferring heat to that surface—the fluid motion is doing the work of moving the heat.