Heat Transfer and Convection Principles

The video explains the three main methods of heat transfer: conduction, convection, and radiation. Conduction occurs in solids, where heat travels through direct contact, like a spoon in hot soup. Radiation involves heat moving through waves, such as the warmth from the Sun. Convection happens in liquids and gases, creating currents as warmer, less dense substances rise and cooler, denser ones sink. Examples include a heated liquid on a burner and a hot air balloon rising due to heated air.

Which of the following is NOT a method of heat transfer?

• Convection

• Evaporation

• Radiation

• Conduction

What happens to the warmer liquid in a convection current?

• It sinks to the bottom

• It evaporates

• It stays in place

• It rises to the top

In a convection current, what causes the cooler liquid to sink?

• It heats up

• It becomes less dense

• It becomes more dense

• It evaporates

How does a hot air balloon lift off the ground?

• By heating the air inside, making it denser

• By cooling the air inside, making it denser

• By heating the air inside, making it less dense

• By cooling the air inside, making it less dense

What role does the burner play in a hot air balloon?

• It cools the air inside the balloon

• It heats the air inside the balloon

• It releases air from the balloon

• It adds weight to the balloon