1. heat as the results of random movement of the molecules of the substance
2. points
   1. attraction between molecules
      1. large in solids
      2. small in liquids
      3. negligible in gases
   2. vibration
      1. solids
         1. fixed positions
      2. liquids
         1. randomly
            1. fixed volumes
      3. gases
         1. freely
            1. all directions
   3. internal molecular energy
      1. shows as heat energy
   4. heat supplied
      1. energy of molecules increases
      2. speed increases
   5. change in state
      1. forces between molecules
         1. have to be overcome
      2. leads to latent heat
         1. fusion
         2. vaporisation
   6. gaseuos pressure
      1. collisions
         1. molecules of a gas
         2. their boundry
   7. evaporation
      1. escape of molecules from surface
      2. cools