Question

2a. convection involves the movement of heat through

choose an option
a waves
b direct contact
c air or water
d a vacuum

2b. select a clip from the video that supports your answer.
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2c. what is an example of convection?
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Explanation:

Convection is a mode of heat transfer that occurs in fluids (liquids like water and gases like air). In convection, warmer, less - dense fluid rises and cooler, denser fluid sinks, creating a circulation pattern.

• Option A (waves) is incorrect as heat transfer by waves is radiation (e.g., heat from the sun reaching the Earth).
• Option B (direct contact) is incorrect as heat transfer by direct contact is conduction (e.g., heat transfer through a metal rod).
• Option D (a vacuum) is incorrect as there are no particles in a vacuum for convection (which requires fluid motion).

For an example of convection, when water is heated in a pot, the water at the bottom gets heated first. It becomes less dense and rises, and the cooler, denser water at the top sinks. This creates a convection current. Another example is the wind. The air above the land heats up faster than the air above the water during the day. The warm air over the land rises, and the cooler air over the water moves in to take its place, creating a sea - breeze (a type of convection current).

Answer:

2A. C. air or water
2C. An example of convection is the circulation of water in a heated pot or the formation of sea - breezes.