I WONDER - What Is Convection?

Convection is a heat transfer process occurring in fluids, including liquids and gases. When heated, fluids become lighter and rise, then cool down, become heavier, and sink, forming a continuous loop. This process is exemplified in a pot of boiling water, where hot water rises, cools at the surface, and sinks again, creating a circulating loop.

What type of substances does convection occur in?

• Liquids and gases

• Gases only

• Liquids only

• Solids only

What happens to a fluid when it is heated?

• It becomes heavier and sinks

• It becomes lighter and rises

• It remains the same

• It evaporates immediately

What is the result of a fluid cooling down after rising?

• It remains at the surface

• It evaporates

• It sinks

• It becomes lighter

What does the cycle of rising and sinking fluid create?

• A static layer

• A solid mass

• A boiling point

• A circulating loop

In a pot of boiling water, what does the hot water do at the surface?

• It solidifies

• It remains hot

• It cools down and sinks

• It evaporates