energy transfer and using energy

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  • Created by: rhouda
  • Created on: 08-12-13 16:19
what is infrared radiation part of?
it is part of the spectrum
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how can we detect infrared radiation?
through our skin it makes us feel warm
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what does infrared radiation travel through
it travels through a vacuum
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what is a good absorber?
dark matt surfaces
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why are houses in hot countries often painted white
because white reflects heat back and will keep the house cool and not hot
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what is a good emitter?
dark matt surafces
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what will a dull black object do?
transfer heat quicker and cool down quicker
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what are good reflectors of infrared radiation?
light shiny surfaces
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what can heating and cooling substances do?
it can change it from any of the three different states of matter
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what do the particles in a solid do?
they vibrate about fixed positions and they have fixed shapes
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what do the particles in a liquid do?
they are in contact with each other and move about they do not have fixed positions
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what do the particles in a gas do?
they are far apart and move at random doesnt have a fixed shape and can flow
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what does conduction occur in?
in solids and metals
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how is energy transferred in solids
the particles at the end of the solid vibrate more and gain kinetic energy then pass the energy through to neighboring particles
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what happens when metals are heated?
they gain kinetic energy making them move through metal faster and they transfer energy by colliding with other particles
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what are poor conductors
they are insulators
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why are materials that trap air good insulators
because the particles move around more freely
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what does convection occur in?
in fluids
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what happens when convection happens in fluids?
they expand when heated and become less dense and rise.
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what happens to warmer fluids?
they get replaced by cooler denser fluids
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why does convection only occur in fluids?
because it requires the movement of atoms and molecules within fluids
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what is evaporation?
liquid is turned into gas
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how does evaporation happen?
most energetic liquid molecules escape the liquids surface and enter the air.
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how is the rate of evaporation increased?
increasing the surface area of the liquid and increasing the temperature of liquid and creating a drought of air across liquids surface
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what is condensation?
gas turning into a liquid
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where does condensation often happen?
on cold surfaces
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how is the rate of condensation increased?
increasing the surface area and reducing the surface temperature
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Other cards in this set

Card 2

Front

how can we detect infrared radiation?

Back

through our skin it makes us feel warm

Card 3

Front

what does infrared radiation travel through

Back

Preview of the front of card 3

Card 4

Front

what is a good absorber?

Back

Preview of the front of card 4

Card 5

Front

why are houses in hot countries often painted white

Back

Preview of the front of card 5
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