Conduction, Convection, & Radiation

What happens to air when it cools?

• When air cools, it becomes denser and sinks.

• When air cools, it expands and rises.

• When air cools, it remains the same density.

• When air cools, it becomes lighter and floats.

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What is convection?

• The transfer of heat through the movement of fluids (liquids or gases).

• The process of heat transfer through direct contact between materials.

• The transfer of heat through electromagnetic waves.

• The movement of air caused by temperature differences in the atmosphere.

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What is conduction?

• Conduction is the transfer of heat through direct contact between materials.

• Conduction is the process of heat transfer through fluids without direct contact.

• Conduction is the movement of heat through radiation in a vacuum.

• Conduction is the transfer of heat through the movement of air particles.

Example of radiation in everyday life?

• Feeling the warmth of the sun on your skin, even when you are not in direct contact with it.

• The sound of a ringing phone.

• The taste of salt in food.

• The sight of a rainbow after rain.

What happens to air when it is heated?

• It contracts and becomes denser.

• It expands, becomes less dense, and rises.

• It remains the same temperature and density.

• It cools down and sinks.

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What is the role of density in convection?

• Density has no effect on convection.

• Hot fluids are more dense and sink, while cooler fluids are less dense and rise.

• Density plays a crucial role in convection; hot fluids are less dense and rise, while cooler fluids are more dense and sink, creating a convection current.

• Density only affects the temperature of the fluid.

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What is the difference between conduction and convection?

• Conduction is heat transfer through direct contact, while convection is heat transfer through the movement of fluids.

• Conduction involves the movement of fluids, while convection is heat transfer through direct contact.

• Conduction is the transfer of heat through radiation, while convection is the transfer of heat through solids.

• Conduction occurs in gases, while convection occurs in liquids.

How does heat transfer from the sun to the Earth?

• Through conduction, as heat travels through solid materials.

• Through convection, as warm air rises and cool air sinks.

• Through radiation, as electromagnetic waves travel through the vacuum of space.

• Through diffusion, as heat spreads from high to low concentration.

What is radiation?

• Radiation is the transfer of heat in the form of electromagnetic waves.

• Radiation is the process of cooling an object by removing heat.

• Radiation is the movement of particles through a medium.

• Radiation is the reflection of light off a surface.

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How does a heat pack warm cold feet?

• Through radiation, as heat is emitted from the pack into the air.

• Through convection, as warm air circulates around the feet.

• Through conduction, as the warmth from the heat pack is conducted into the cooler feet.

• Through evaporation, as moisture from the feet cools the pack.

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