Question

identifying convection
which statements represent convection? select two options.
□ black asphalt gets very hot on a sunny day.
□ the movement of air in a hot - air balloon makes it rise into the sky.
□ a dark sand beach can burn the soles of your feet.
□ a spoon gets warm from sitting in a soup pot.
□ a house has high heating bills because the heat ends up in the attic.
□ a house loses heat through an exterior wall.

Explanation:

Convection is heat transfer via movement of fluids (liquids/gases).

• The hot-air balloon relies on warm, less dense air rising (fluid movement = convection).
• Heat rising to a home's attic is caused by warm air (a fluid) moving upward, which is convection.

The other options describe conduction (spoon in soup, hot sand/asphalt burning feet, heat through walls) or radiation (asphalt heating in sun), not convection.

Answer:

B. The movement of air in a hot-air balloon makes it rise into the sky.
E. A house has high heating bills because the heat ends up in the attic.