Natural Sciences Grade 7 Term 3 Energy and
![Natural Sciences Grade 7 Term 3: Energy and Change Heat transfer Natural Sciences Grade 7 Term 3: Energy and Change Heat transfer](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-1.jpg)
![Topic 3 Heat transfer Radiation Natural Sciences - Grade 7 Topic 3 Heat transfer Radiation Natural Sciences - Grade 7](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-2.jpg)
![Radiation [part 1] Natural Sciences - Grade 7 Radiation [part 1] Natural Sciences - Grade 7](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-3.jpg)
![Radiation [part 2] • Radiation – is the transfer of heat energy by electromagnetic Radiation [part 2] • Radiation – is the transfer of heat energy by electromagnetic](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-4.jpg)
![Radiation [part 3] Radiation – The way conduction and convection transfer heat energy, differs Radiation [part 3] Radiation – The way conduction and convection transfer heat energy, differs](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-5.jpg)
![Radiation [part 3] The sun’s heat energy mainly travels across the empty space to Radiation [part 3] The sun’s heat energy mainly travels across the empty space to](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-6.jpg)
![Radiation examples 1. Braai: the meat on the braai grid gets cooked through the Radiation examples 1. Braai: the meat on the braai grid gets cooked through the](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-7.jpg)
![Radiation examples 3. Warming hands above a heater/fire is also possible through radiation. 4. Radiation examples 3. Warming hands above a heater/fire is also possible through radiation. 4.](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-8.jpg)
![Absorption and reflection of radiated heat 1. Radiation waves are not absorbed by every Absorption and reflection of radiated heat 1. Radiation waves are not absorbed by every](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-9.jpg)
![Absorption and reflection of radiated heat 4. Objects that are black, absorb radiation waves Absorption and reflection of radiated heat 4. Objects that are black, absorb radiation waves](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-10.jpg)
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![Natural Sciences Grade 7 Term 3 Energy and Change Heat transfer Natural Sciences Grade 7 Term 3: Energy and Change Heat transfer](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-1.jpg)
Natural Sciences Grade 7 Term 3: Energy and Change Heat transfer
![Topic 3 Heat transfer Radiation Natural Sciences Grade 7 Topic 3 Heat transfer Radiation Natural Sciences - Grade 7](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-2.jpg)
Topic 3 Heat transfer Radiation Natural Sciences - Grade 7
![Radiation part 1 Natural Sciences Grade 7 Radiation [part 1] Natural Sciences - Grade 7](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-3.jpg)
Radiation [part 1] Natural Sciences - Grade 7
![Radiation part 2 Radiation is the transfer of heat energy by electromagnetic Radiation [part 2] • Radiation – is the transfer of heat energy by electromagnetic](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-4.jpg)
Radiation [part 2] • Radiation – is the transfer of heat energy by electromagnetic waves. • These are special waves that can carry heat and light energy. • The sun’s heat energy travels across empty space to the Earth, mainly through radiation. Natural Sciences - Grade 7
![Radiation part 3 Radiation The way conduction and convection transfer heat energy differs Radiation [part 3] Radiation – The way conduction and convection transfer heat energy, differs](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-5.jpg)
Radiation [part 3] Radiation – The way conduction and convection transfer heat energy, differs tremendously from the way radiation transfers heat energy. Conduction and convection transfer heat energy through matter, which can either be a gas/solid/ liquid. Radiation transfers heat energy by waves, not by matter. Radiation does not require movement of particles or physical contact. This means heat energy can be transferred in a vacuum [space without matter/gas]. Natural Sciences - Grade 7
![Radiation part 3 The suns heat energy mainly travels across the empty space to Radiation [part 3] The sun’s heat energy mainly travels across the empty space to](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-6.jpg)
Radiation [part 3] The sun’s heat energy mainly travels across the empty space to the Earth through radiation. Every electromagnetic source [e. g. the Sun; fire; microwave oven] radiates waves and it heats up when it comes into contact with another object. Natural Sciences - Grade 7
![Radiation examples 1 Braai the meat on the braai grid gets cooked through the Radiation examples 1. Braai: the meat on the braai grid gets cooked through the](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-7.jpg)
Radiation examples 1. Braai: the meat on the braai grid gets cooked through the transferred heat from the red coals through radiation. 2. Food is warmed in a microwave oven through radiation. Natural Sciences - Grade 7
![Radiation examples 3 Warming hands above a heaterfire is also possible through radiation 4 Radiation examples 3. Warming hands above a heater/fire is also possible through radiation. 4.](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-8.jpg)
Radiation examples 3. Warming hands above a heater/fire is also possible through radiation. 4. The sun warms us without touching us through radiation. Natural Sciences - Grade 7
![Absorption and reflection of radiated heat 1 Radiation waves are not absorbed by every Absorption and reflection of radiated heat 1. Radiation waves are not absorbed by every](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-9.jpg)
Absorption and reflection of radiated heat 1. Radiation waves are not absorbed by every substance. 2. Certain substances become hot very quickly because radiation waves are easily absorbed. 3. Radiation waves are also reflected by other substances: - the waves bounce off the substance; - these specific substances do not heat up quickly. Natural Sciences - Grade 7
![Absorption and reflection of radiated heat 4 Objects that are black absorb radiation waves Absorption and reflection of radiated heat 4. Objects that are black, absorb radiation waves](https://slidetodoc.com/presentation_image_h2/5600202b0332db8d9669cb20c88f9ce2/image-10.jpg)
Absorption and reflection of radiated heat 4. Objects that are black, absorb radiation waves very well and they heat up quickly. 5. Radiation waves are reflected from silver and white objects. The sun warms us without touching us through radiation. Natural Sciences - Grade 7
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