How Is Heat Transferred? (Part 2)

What is convection?

• The flow of energy through a liquid or gas caused by hot particles rising and cool particles sinking.

• The transfer of heat through direct contact between objects.

• The emission of heat in the form of electromagnetic waves.

• The process of heat transfer through solid materials.

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NGSS.MS-PS1-4

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What happens to fluids when they heat up?

• They expand and become less dense.

• They contract and become denser.

• They remain unchanged.

• They solidify.

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NGSS.MS-PS1-4

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What is a convection current?

• The circular motion of liquids or gases during convection.

• The transfer of heat through direct contact.

• The emission of heat in the form of waves.

• The process of heat transfer in solids.

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NGSS.MS-ESS2-5

Which of the following is an example of convection?

• Warm air rising and cool air sinking in the atmosphere.

• Heat transfer through a metal rod.

• Sunlight warming the Earth's surface.

• Ice melting in a glass of water.

Why do warm fluids rise and cool fluids sink?

• Warm fluids are less dense, and cool fluids are denser.

• Warm fluids are heavier, and cool fluids are lighter.

• Warm fluids are solid, and cool fluids are liquid.

• Warm fluids are magnetic, and cool fluids are non-magnetic.

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NGSS.MS-PS1-4

Click on the example of CONDUCTION in the picture!

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NGSS.MS-PS1-4

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Boiling Water (a)  

• Conduction
• Convection
• Radiation

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NGSS.MS-PS1-4

NGSS.MS-PS3-3

NGSS.MS-PS3-4

When your feet touch hot sand, heat moves from the sand to your feet. What type of heat movement is this? (a)  

• Conduction
• Convection
• Radiation

Label the image.

a

b

c

Conduction

Radiation

Convection

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NGSS.MS-PS3-3

Select the model that correctly shows how particles in the air flow in a convection current.

• A

• B

• C

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NGSS.MS-ESS2-6