Heat Transfer
- Created by: Rosie 3
- Created on: 18-05-15 18:23
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- Heat Transfer
- Conduction
- Needs particles
- Metals: GOOD conductors
- Non-metals & gases: POOR condutors
- INSULATOR
- From hot end of an object to cold end
- Free electrons LEAVE atoms
- Positive ions left behind
- Move through structure of metal, colliding with ions as they go
- Ions packed tightly
- Vibrate continually
- Hotter metal: more kinetic energy
- Vibrate continually
- Convection
- Cool air denser: falls
- Liquids & Gases
- Expand when heated
- Particle GAPS get wider (NOT particles)
- Expand when heated
- Need particles
- Hot air less dense: rises
- Radiation
- NO particles needed
- Works through vacuums
- Black surface: Good absorber & emitter
- White surface: Poor absorber & emitter
- Insulation
- Double glazing
- Cavity wall insulation
- Loft Insulation
- Conduction
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