96279
Description
Mind Map by sulemanadam99, updated more than 1 year ago
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Created by sulemanadam99
almost 11 years ago
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Thermal Energy transfer and storage
- Warmer object than surrounding loses energy
- Cooler object gains energy
- Conduction
- Metals are the best conductors
- When a substance is heated,
its particles gain energy and
vibrate more vigorously. The
particles bump into nearby
particles and make them
vibrate more. This passes the
thermal energy through the
substance by conduction,
from the hot end to the cold
end.
- metal spoon in hot drink
- Conductors allow easy heat transfer
- Insulators do not allow easy thermal energy transfer (air/plastic)
- Metals are the best conductors
- Convection
- liquids/gases
- Particles with high thermal energy move around and can take place of particles with less thermal energy
- Thermal energy is transferred from hot place to cold place by convection
- eg. radiator
- Hot air rises, convection current, cools as it rises , then comes down....
- air gets heated, air exands, less dense, rises, replaced by cooler air.
- liquids/gases
- Radiation
- Doesn't need particles for heat energy transfer
- eg. we can feel heat from sun from miles away
- eg. infrared night camera
- All objects transfer thermal energy by
infrared radiation. The hotter an object is,
the more infrared radiation it gives off.
- No particles are involved in radiation, unlike
conduction and convection. This means that
thermal energy transfer by radiation can even work
in space and in a vacuum, but conduction and convection cannot
- Doesn't need particles for heat energy transfer
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