P1.1.4 Conduction P1.1.5 Convection

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  • Created by: Maddi
  • Created on: 19-04-14 13:17
What is convection?
Convection is the circulation of a fluid (liquid or gas) caused by heating it.
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Where can convection take place?
Convection takes place only in liquids and gases.
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Why does convection occur?
Heating a liquid or a gas makes it less dense so it rises and causes circulation.
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Why doesn't conduction occur in solids?
Conduction does not occur in solids because the particles are held in fixed positions and not able to flow.
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Give an example of convection.
Convection is responsible for onshore and offshore breezes.
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What is conduction?
Transfer of energy from particle to particle in matter.
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What materials make the best conductors?
Metals are the best conductors of energy.
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What materials make the best insulators?
Materials such as wool and fiberglass make the best insulators.
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Why are metals good conductors?
Conduction of energy in a metal is due mainly to free electrons transferring energy inside the metal.
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Why are non metals poor conductors?
Non-metals are poor conductors because they do not contain free elctrons.
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Stages of conduction. (non-metals)
Particles gain kinetic energy + vibrate more --> energy is passed to neighbouring particles --> energy is transferred through the solid
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Stages of conduction. (metals)
Free electrons gain kinetic energy + move through metal --> they transfer energy by colliding with other particles --> energy is transferred
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Stages of convection.
Fluid heated --> fluid expands --> fluid becomes less dense --> fluid rises --> warm fluid replaced by cooler, denser fluid --> convection current formed
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Stages of convection. (immersion heater)
Water particles gain energy + move faster --> particles move apart --> water becomes less dense --> hot water rises through tank
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Other cards in this set

Card 2

Front

Where can convection take place?

Back

Convection takes place only in liquids and gases.

Card 3

Front

Why does convection occur?

Back

Preview of the front of card 3

Card 4

Front

Why doesn't conduction occur in solids?

Back

Preview of the front of card 4

Card 5

Front

Give an example of convection.

Back

Preview of the front of card 5
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