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Heat Energy - Coggle Diagram

- - - - When heated, particles gain heat energy and vibrate more vigorously, transferring heat energy from one particle to another.
      - Solids conduct heat better than liquids and gases because their particles are closely packed.
      - Slow process of heat transfer
    - - Only in metals
      - Helps transfer heat energy from the hotter to the cooler region quickly
      - Fast process of heat transfer
  - - - Cooking utensils are made of metals
      - Radiators in cars and buses use copper
      - Electric kettles have metal heating elements
    - - Handles of cooking utensils are made of insulators
      - Woolen jackets trap air
- - - - Convection requires particles to move freely
  - - - Heated water with lower density
        
        Rises
      - Colder water of higher density
        
        Sinks
  - - - Heating element is placed at the bottom of a kettle
    - - Boiler is installed at the lower part of a hot water system
    - - Placed at the top of the wall
  - - - Happens in daytime
      - Land is heated up faster than the sea
      - Air above the land is warmer than above the sea, hence it rises up
      - Cooler and denser air from the sea flows in to replace the rising hot air
    - - Happens in night time
      - Land loses heat much faster than the sea
      - Cooler and denser air from the land flows towards the sea to replace the rising hot air
      - Air above the sea is much warmer than above the land, hence it rises up
- - - - Does not require a medium
  - - - Gives off heat
    - - Takes in heat
    - - Bounces off radiation
  - - - Larger Surface Area = Faster Heat Transfer
    - - Higher Temperature = Higher Rate
    - - Black, dull and rough surfaces
        
        Best absorbers and emitters of radiant heat
        
        Poor reflectors
      - White, shiny and smooth surfaces
        
        Poor absorbers and emitters of radiant heat
        
        Good reflectors
  - - - Cooling coils are painted black
    - - White is a poor absorber of heat
    - - Have a shiny appearance
- - - - Due to an increase of kinetic energy in the particles, causing them to push each other further apart
  - - - Small gaps left between sections of railway tracks
    - - Gaps are left between sections
    - - Curved joints or coiled pipes
    - - One end is fixed, the other end is movable
  - - - Fire Alarm
      - Electric Iron