Question

Which statements best describe convection? Check all that apply.

Convection occurs in solids.
Convection occurs in liquids and gases.
Convection transfers thermal energy.
Convection transfers potential energy.
Convection occurs until all of the fluid is at the same temperature.
Convection occurs only one time, no matter the temperature.

Answer 1

Correct answers: 2 and 3.

- Convection occurs in liquids and gases. — True. Convection is bulk fluid motion, so it happens in fluids (liquids and gases), not solids.
- Convection transfers thermal energy. — True. Moving fluid carries heat (thermal energy) from one place to another.

Reasons the others are incorrect:
- Convection occurs in solids. — False. Solids transfer heat mainly by conduction, not bulk fluid motion.
- Convection transfers potential energy. — Generally False for the simple definition. Convection primarily transports thermal (and kinetic) energy; moving fluid can carry potential energy, but that is not the defining feature of convection in typical thermal-physics contexts.
- Convection occurs until all of the fluid is at the same temperature. — False. Convection occurs while there are driving temperature/density differences; it may reach equilibrium or a steady-state flow without uniform temperature everywhere.
- Convection occurs only one time, no matter the temperature. — False. Convection can occur repeatedly or continuously whenever conditions (temperature gradients) drive fluid motion.