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Heat KS3 Y8
- Conduction
- An object which has more HEAT or THERMAL ENERGY than another has molecules which vibrate quicker
- A thermometer has a rough idea of the amount of thermal energy
- Heat transfersfrom a higher to a lower temperature
- Solids are better heat conductors than liquids
- Stronger bonds in the solids than liquids
- Stronger bonds in the solids than liquids
- Liquids are better than gases
- Heat transfers by comduction are when the objects are in contact and the particles don't move.
- A thermometer has a rough idea of the amount of thermal energy
- Metals are the best conductors
- Free electrons
- Free electrons
- An object which has more HEAT or THERMAL ENERGY than another has molecules which vibrate quicker
- Convection
- Heat transfers thanks to the movement of matter (Liquids and gases)
- Heat doesn't rise
- Hot air rises
- Hot air rises
- Heat doesn't rise
- Hot water/air rises because it is less dense than cold water/air
- Hot water is less dense than cold
- Has less particles per unit of volume
- Hot materials expand and the particles vibrate more and push each other away
- Has less particles per unit of volume
- Hot water is less dense than cold
- Heat transfers thanks to the movement of matter (Liquids and gases)
- Radiation
- Heat transfers by radiation
- Without...
- Movement
- Presence of matter
- Movement
- Thermal energy is transferred by light
- Electromagnetic Waves called infared
- Electromagnetic Waves called infared
- Using black and shiny surfaces
- Black surfaces are better infrared emitters than shiny ones.
- Black surfaces are good absorbers
- Shiny surfaces are good reflectors
- Black surfaces are good absorbers
- Black surfaces are better infrared emitters than shiny ones.
- Without...
- Heat transfers by radiation
- Vacuum flask
- Stops heat transfers from higher temperatures to lower ones
- Insulators reduce heat loss by conduction
- Need to trap air
- No convection
- Carpets on the floor (traps air)
- Carpets on the floor (traps air)
- gases are better insulators than solids and liquids
- less conduction
- less conduction
- Can use glazed windows
- Fibre glas son the loft
- Fibre glas son the loft
- Cavity wall insulation
- No convection
- Need to trap air
- Vacuum stops it by conduction and convection
- Shiny glass reflects infrared light and reduces heat loss by radiation
- Bung stops heat loss by convection
- Insulators reduce heat loss by conduction
- Stops heat transfers from higher temperatures to lower ones
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