Curriculum
Science — Second Preparatory
Unit 1: Matter and Energy
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Unit 2: Matter and Chemical Reactions
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Unit 3: Energy Flow in Photosynthesis and Respiration
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Unit 4: Geological Processes
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Text lesson
Heat Transfer
Heat Transfer
Radiation
Radiation
Radiation→is the transfer of heat by electromagnetic waves. It does not need a material medium, so the heat of the Sun reaches the Earth across the empty space between them.
- Dark and rough surfaces absorb more radiation.
- Shiny and silver surfaces reflect most of the radiation, which is why some devices are coated with a shiny metal.
- This also explains why people often wear light-coloured clothes in summer: they absorb less radiation than dark clothes.
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