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Published byPreston Banks Modified over 9 years ago
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Today’s lesson Heat transfer If you’re waiting you can finish your “convection” mind map
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Heat transfer
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Heat can travel by Convection A hot fluid expands, so is less dense, so rises. Cold fluid takes its place. A convection current can be formed.
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Examples of Convection
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Heat cannot travel in solids by convection. Why ?
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Heat can also travel by Conduction
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Gather round Mr Porter
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Heat can travel by Conduction Hot particles vibrate more, so bump into adjacent particles.
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Heat can travel by Conduction Metals are good conductors of heat Why ?
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Heat can travel by Conduction Most gases are poor conductors of heat (insulators) Why ?
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There’s one other way! ¡Uno mas!
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Can you quickly, quietly and sensibly follow Mr Porter
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Heat transfer by infrared radiation This is an invisible form of light It can travel through a vacuum Heat from the sun reaches us through space by infrared radiation
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Infrared radiation Mmmm. Nice and warm
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Infrared images
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Let’s experiment! Yes!
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Time (mins)Temp of black tin/°C Temp of shiny tin/°C 0 1 2 3 4 5 6 7 8 9 10
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Infrared radiation Black objects are good absorbers of infrared radiation.
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Infrared radiation Shiny objects reflect infrared radiation. Nottingham Forest winning the champions league in 1979
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