Which process transfers heat through the movement of currents within fluids?

Which process transfers heat through the movement of currents within fluids?

• A. Conduction
• B. Convection
• C. Radiation
• D. Mass energy

Answer: (B)

Convection is heat transfer driven by the movement of fluid currents. When part of a fluid gets warm, it becomes less dense and rises, while cooler, denser fluid sinks to take its place. This ongoing circulation carries thermal energy with the moving fluid, spreading heat through the liquid or gas. That behavior exactly matches the description in the question, so convection is the correct mechanism. For contrast, conduction transfers heat through direct contact without bulk fluid movement, radiation moves heat via electromagnetic waves (can occur without a medium), and “mass energy” isn’t a standard term for heat transfer in this context.

Convection is heat transfer driven by the movement of fluid currents. When part of a fluid gets warm, it becomes less dense and rises, while cooler, denser fluid sinks to take its place. This ongoing circulation carries thermal energy with the moving fluid, spreading heat through the liquid or gas. That behavior exactly matches the description in the question, so convection is the correct mechanism. For contrast, conduction transfers heat through direct contact without bulk fluid movement, radiation moves heat via electromagnetic waves (can occur without a medium), and “mass energy” isn’t a standard term for heat transfer in this context.