This GCSE video tutorial covers the three methods of heat transfer: conduction, convection, and radiation. It explains how heat moves from hot to cold objects, detailing the process of conduction in solids, where particles vibrate and transfer energy. Convection is described in fluids, where heated particles move apart, become less dense, and rise. Radiation is explained as energy transfer through infrared waves, even in a vacuum, with examples of absorption and emission by different materials.

What is the basic principle of heat transfer?

• Heat does not move

• Heat moves randomly

• Heat moves from hot to cold

• Heat moves from cold to hot

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In which state of matter does conduction primarily occur?

• Solids

• Liquids

• Gases

• Plasma

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Why are metals good conductors of heat?

• They are shiny

• They are dense

• They have tightly packed particles

• They have free electrons

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What happens to particles in a fluid when they gain energy?

• They change shape

• They stop moving

• They move further apart

• They move closer together

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What causes the fluid to rise during convection?

• It becomes less dense

• It becomes more dense

• It becomes solid

• It becomes colder

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How does heat transfer from the Sun to the Earth?

• Convection

• Conduction

• Ultraviolet radiation

• Infrared radiation

What type of wave is infrared radiation?

• Sound wave

• Water wave

• Light wave

• Mechanical wave

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Which color absorbs more infrared radiation?

• Blue

• Red

• White

• Black

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What does 'emit' mean in the context of radiation?

• To change color

• To give out

• To absorb

• To reflect

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Why are spacesuits white?

• To emit more heat

• To look cool

• To reflect more radiation

• To absorb more heat