HEAT

1.1 Temperature, heat and internal energy

 

temperature and thermometers

  • temperature as the degree of hotness of an object
  • interpretation of temperature as a quantity associated with average kinetic energy due to the random motion of the molecules in a system
  • use of temperature-dependent properties to measure temperature
  • degree Celsius as a unit of temperature
  • fixed points on the Celsius scale
 

heat and internal energy

  • heat as the energy transferred resulting from the temperature difference between two objects
  • internal energy as the energy stored in a system
  • interpretation of internal energy as the sum of the kinetic energy of random motion and the potential energy of the molecules in a system
 

heat capacity and specific heat capacity

  • definitions of heat capacity and specific heat capacity
  • application of the formulato solve problems
  • practical importance of the high specific heat capacity of water

1.2 Transfer processes

 

conduction, convection and radiation

  • conduction, convection and radiation as means of energy transfer
  • interpretation, in terms of molecular motion, of energy transfer by conduction in solids and by convection in fluids
  • emission of infra-red radiation by hot objects
  • factors affecting the emission and absorption of radiation

1.3 Change of state

 

melting and freezing, boiling and condensing

  • melting point and boiling point


 

latent heat

  • latent heat as the energy transferred during a change of state at constant temperature
  • interpretation of latent heat in terms of the change of potential energy of the molecules during a change of state
  • definitions of specific latent heat of fusion and specific latent heat of vaporization
  • application of the formula to solve problems
 

evaporation

  • occurrence of evaporation below boiling point
  • cooling effect of evaporation
  • factors affecting rate of evaporation
  • interpretation of evaporation in terms of molecular motion
[top]