Zusammenfassung der Ressource
Heat
- Heat transfer
- Conduction (contact)
- Definition
- Flow of heat
- High to low temperature
- Without movement of matter as awhole
- Medium
- Solids : Best conductors
- Good conductors
- E.g. Metals
- Poor conductors (Insulators)
- Air
- Materials that trap air
- E.g. foam, feathers
- Gases : Worst conductors
- Convection
- Definition
- From high to low level
- Flow of heat
- Movement of liquids of gases as a whole
- Medium
- Occurs in liquids and gases
- Convection current (flow)
- Hot air rises
- Expands so the air is less dense
- Cold air sinks
- Contacts so the air is less dense
- Radiation
- Definition
- Flow of heat
- From high to low temperature
- By electromagnetic waves
- Medium
- Solids, liquids and gases
- Can pass through a vacuum
- Colours
- Matte black
- Best absorber and emitter
- Shiny silver
- Worst absorber and emitter
- Very good refector
- Heat and its effects
- Expansion and contraction
- Expansion
- Object expand and increase in volume
- Contraction
- Objects contract and decrease in volume