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6 Cards in this Set
- Front
- Back
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What is infrared radiation |
Infrared radiation is the emission of electromagnetic waves |
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What surface and colour is best for absorbing and emitting IT? |
Dark, matt surfaces absorb and emit IR best |
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What is conduction of heat? |
Conduction of heat is when vibrating particles pass on their extra Kinetic energy to neighbouring particles |
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How is heat transferred in a metal? |
In a metal, electrons are free to move so they gain energy at the hot end and collide with other electrons and pass on their extra energy. The is process repeats until the heat has reached the cooler side of the metal |
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What is convection? |
Convection is when more energetic particles move from the hotter to the cooler region and take their energy with them |
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What makes convection currents occur |
When particles gain more energy they move about more and the fluid becomes less dense so they rise above The denser (colder) fluid and displace them, forcing them down. This creates a convection current |
