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Heat 🔥(Kaelen), Hotter region (heat source), Solutions, Explanation,…

- - - - Spaced further apart
  - - - Thus they expand and contract the fastest.
  - - - leave a gap in the tracks
        
        Space for expansion on a hot day
      - Pipes burst when hot water passes through
        
        Pipes have curved joints or are coiled
        
        Bending gives it space when hot water passes
        
        Bridges bending on a hot day
        
        One side has a fixed end, the other has a movable joint
        
        Space for the bridge to expand on hot days.
  - - - Holding 2 metal plates by contracting, clipping them together
    - - Heat the metal tire and put the wheel inside, fitting them perfectly
    - - Acts as a thermostat
      - Brass & Iron
        
        Why just brass & iron???
        
        They have different rates of expansion
        
        This causes the bimetallic strip to bend in one direction
        
        Allowing fire alarms and electric kettles to be activated by bending and connecting/disconnecting the circuit
        
        Brass expands & contracts faster than iron
      - Used in fire alarms & electric kettles
- - - - In solids, the particles are closer
        
        So they vibrate and transfer heat the fastest
      - Slow transfer of heat
    - - Only metals have free electrons
        
        So they are the fastest conductors of heat
      - Fast transfer of heat
  - - - Wool & air
        
        Body to surroundings (slowly)
    - - non-metal
        
        Food to hand (slowly)
    - - copper
        
        hot water to surroundings (quickly)
    - - metal
        
        Heat to the food (quickly)
- - - - Colder region (heat sink)
    - - It measures how hot or cold smth is
- - - - Cold = increase = sink
      - Hot = decrease = float
      - So the cycle repeats, allowing even heating.
- - - - Colour & texture
        
        Black, dull, rough
        
        Poor reflectors, good absorbers
        
        (Good emitters)
        
        White, shiny, smooth
        
        Good reflectors, poor absorbers
        
        (Poor emitters)
        
        (kinda like light)
      - Surface temp
      - Surface area
  - - - Cooling coils painted black
    - - White clothes, not overheated
    - - Shiny, reflect heat
- - - - Stops convection currents from forming
        
        Convection
    - - heat gets conducted slower
        
        Conduction
    - - Only radiation can happen to transfer heat
        
        Conduction & Convection
    - - Reflects heat back to the surroundings
        
        Radiation