Heat Energy Transfer

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What are the three methods of heat transfer?

Conduction, convection, and radiation.

How does conduction transfer heat?

Conduction transfers heat through direct contact between molecules in a solid.

What is an example of convection?

Boiling water, where heat is transferred by the movement of liquid.

How does radiation differ from conduction and convection?

Radiation transfers heat through electromagnetic waves, not requiring a medium.

What is an insulator?

A material that slows down or prevents the transfer of heat.

Give an example of a good conductor of heat.

Metal, such as copper.

Why do metal handles on pots get hot?

Due to conduction, where heat travels from the pot to the handle.

What role does convection play in heating a room?

Heated air rises and cooler air sinks, circulating warmth throughout the room.

What is thermal equilibrium?

A state where two objects at different temperatures reach the same temperature.

Why does a black object heat up faster in the sun than a white object?

Black surfaces absorb more radiation than white surfaces.

How do greenhouses use heat transfer principles to stay warm?

They trap heat through the glass, allowing radiation in but preventing convection out.

How does double glazing reduce heat loss?

It traps a layer of air between two glass panes, reducing conduction and convection.

What household item utilizes radiation to keep food warm?

A microwave oven.

Why do woolen clothes keep you warm in winter?

Wool fibers trap air, reducing heat loss through convection and conduction.

What is thermal conductivity?

It measures a material's ability to conduct heat.