3 major types of heat transfer: Conduction Convection
Radiation
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Radiation is the ___PRIMARY_ __WAY_____ heat is transferred
that can move through the relative ___EMPTINESS___ of space. The
majority of our energy arrives in the form of __RADIATION__ from
our Sun. Objects that are good absorbers of radiation are good
RADIATORS_ as well. When the Sun heats the Earth, the Earth gets
warmer in that location and _RE-RADIATES__ heat into the
atmosphere, making it doubly warm.
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Popcorn? How do we make popcorn using radiation? The kernels
are heated by the radiation in the microwave, and the kernels heat
up, giving off more heat to the kernels surrounding it and making
it doubly warm.
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Conduction is HEAT TRANSFER through matter. _METALS__conduct
heat well. _AIR___is not as good a conductor of heat. This is a
_DIRECT_ _CONTACT type of heat transfer. The only air heated by the
Earth is the air at the _EARTHS_____ _SURFACE__. As a means of heat
transfer, conduction is the _LEAST___ ___SIGNIFICANT________ with
regard to heating the Earths atmosphere.
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Popcorn? How do we make popcorn using Conduction? The heat is
transferred by direct contact from the pan to the oil to the
kernels of popcorn.
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Convection is _HEAT_____ __TRANSFER__ by the movement of mass
from one place to another. It can take place only in _LIQUIDS______
and _GASES______. Heat gained by conduction or radiation from the
sun is _MOVED____ about the planet by _CONVECTION__. The hot air
RISES, allowing cooler air to SINK and move in underneath the warm
air creating a CIRCULAR movement in a convection current.
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Popcorn? How do we make popcorn using Convection? The hot air
transfers the heat to the cooler kernels, and when enough hot air
heats the kernels they pop.
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Review Convection Radiation Conduction
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What type of heat transfer is seen in this picture?
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Finish INB P 67 draw a picture and label all three types of
heat transfer OR Write a paragraph describing the three types of
heat transfer P 68 Glue in your heat transfer foldable rank in
order from #1-3 the order the earth is heated. #1 the best way the
earth is heated.
