Science Unit 1

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  • Created by: Charlotte
  • Created on: 12-05-14 17:52
What is conduction?
Conduction mainly happens in solids. it is where one solid vibrates, it bumps into other particles near by and quickly passes on vibrations. Particles that vibrate faster pass on extra kinetic energy, gradually the eheat spreads to the other side.
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Why do metals conduct really well?
because some of their electrons are free to move. Heating makes the elctrons move faster and colllide with other free electrons , transferring energy, this is a much faster way of transferring energy.
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What is Conduction?
when a liquid is heated, the particles move faster and the fluid expands and becomes less dense. The warmer,less dense fluid rises above it's colder,denser surroundings . As warm air rises, cool air takes it's place. End up with a convection current.
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Where does convection usually occur?
Liquids or gases.
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Where can radiation occur?
It doesn't need a medium (material) to travel through, so it can occur in a vacuum. It can only occur through transparent substances, like air, glass and water.
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how much radiation is emmited or absorbed by an object?
it depends to a large extent on its surface colour and texture.
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What objects emmit and absorb radiation?
All objects continually emmit and absorb heat radiation. the hotter the object, the more heat radiation it emmits. Cooler objects will absorb the heat radiation emitted by hotter things, so their temperature increases.
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What are the best materials for emitting and absorbing heat radiation?
Matte black surfaces are very good at emitting and absorbing radiation. Light-coloured, smooth and shiny objects are very poor absorbers and emitters of radiation. the reflect the radiation.
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Other cards in this set

Card 2

Front

Why do metals conduct really well?

Back

because some of their electrons are free to move. Heating makes the elctrons move faster and colllide with other free electrons , transferring energy, this is a much faster way of transferring energy.

Card 3

Front

What is Conduction?

Back

Preview of the front of card 3

Card 4

Front

Where does convection usually occur?

Back

Preview of the front of card 4

Card 5

Front

Where can radiation occur?

Back

Preview of the front of card 5
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