The amount of energy needed to change the temperature of 1kg of a substance by 1 degrees celcius
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Why is cavity wall insulation better than using just air?
Using just air would cause a convection current which is when hot air rises, cooler air falls. The air trapped in the foam would stop this from taking place
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What is meant by infrared radiation?
It is an electromagnetic wave which is how warm things become warm.
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What is the unit of heat?
joule
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What is the unit of temperature?
degrees celcius
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What is the melting point of ice?
100
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What is the boiling point of water?
100
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190 MJ of energy are needed to melt 500kg of aluminium at 660°C. Calculate the specific latent heat of aluminium.
380000J/kg
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What is the formula for Energy Transferred Specific heat Capacity?
mass x specific heat capacity x temp difference
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Why is air a poor conductor?
The particles spread out
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What is heat?
heat is the transfer of energy
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what is temperature?
temperature is the hottness on a chosen scale
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what is payback time?
payback time is the time it takes for the original cost to cover the savings.
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how do you work out payback time?
payback time=cost/saving
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A gas boiler wastes 355J for every 1350J of evergy it is supplied with. what is the efficiency of this appliance?
74%
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Other cards in this set
Card 2
Front
Why is cavity wall insulation better than using just air?
Back
Using just air would cause a convection current which is when hot air rises, cooler air falls. The air trapped in the foam would stop this from taking place
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