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P3 Thermal physics(Ian) (Kinetic molecular model of matter (solid (It can…
P3 Thermal physics(Ian)
Thermal processes
Conduction
Conduction is the movement of heat from one side to another side that has a lower
temperature when they are touching each other.
For non-metal solids:
- Energy is transferred because the vibrating atoms jostle (or push) one another
- This shares energy between neighboring atoms
- The result is a flow of energy from the hot end to the cold end
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Convection
Convection is the heat transfer due to the bulk movement of molecules within fluids such as gases and liquids.
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Materials that have trapped air in them such as cotton wool or bubble wrap are good insulators, because air does not conduct heat, and trapped air cannot have convection
Radiation
All hot objects emit infrared radiation, part of the electromagnetic spectrum of waves
Like all electromagnetic waves, infrared radiation can travel across a vacuum, which
is why we are able to feel the heat of the Sun across the vacuum space.
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