Heat Transfer

Heat Transfer

Convection, Conduction, Radiation

​Heat Transfer

​Heat is the transfer of thermal energy from one object to another.

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This can occur three ways:

• ​Convection

• ​Conduction

• ​Radiation

Multiple Choice

Which of the following is not a form of heat transfer?

• Convection

• Conduction

• Insulation

• Radiation

​Conduction

​Heat transfer through direct contact between two objects or substances

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​Best in solids

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​When two things are touching, their particles interact and heat is transferred between them.

Multiple Select

Which of the following are examples of heat transfer through conduction? You may choose more than one.

• Using hand warmers to warm up your hands

• Hot air balloon rising

• Burning your hand on a curling iron

• Spoon getting hot while sitting in hot tea

​Convection

​Occurs in fluids like liquids and gases

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​As fluid heats up, the particles spread out, become less dense and rise

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​As fluids cool down, the particles become more dense and sink

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​"Heat Rises"

Multiple Select

Which of the following are examples of heat transfer through convection?

You may choose more than one.

• Hot air balloon rising

• The second floor of a house is warmer than the first floor

• Boiling water on the stove

• Sitting around a campfire and feeling the heat from the flames

​Radiation

​Transfer of thermal energy through waves

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​If you hold your hand near a hot object (such as a lightbulb or a candle), you can feel the heat transferred through waves

Multiple Select

Which of the following are examples of heat transfer through radiation? You may choose more than one.

• Feeling the heat from a candle

• The water at the top of the pool feels warmer than the deep end

• The sun warming the Earth

• A space heater warming the room