science f2 chap9

• Heat


  A form of energy
• Temperature


  The degree of hotness or coldness of an object
• Difference between Heat and Temperature

  Heat is a form of energy, measured in joules (J)

  Temperature is the degree of hotness or coldness of an object, measured in degrees Celsius (°C) or Kelvin (K)
• Heat Flow


  The process of heat transfer from hotter regions to colder regions
• Conduction


  The process of heat transfer from hotter regions to colder regions through a solid medium
• Convection


  Heat is transferred by the movement of fluid (liquid and gas) from hotter regions to colder regions
• Radiation


  The process of transferring heat without any medium
• Heat Flow in Natural Phenomena

  • Sea Breeze
  • Land Breeze
• Heat Conductor


  Materials that allow heat flow
• Example of Heat Conductor

  • Mercury in thermometers is a good heat conductor. It can detect change in temperature very quickly
• Heat Insulator


  Materials that prevent heat flow
• Example of Heat Insulator

  • Oven gloves that are heat insulators can prevent our hands from getting scalded while taking food trays out from the oven
• What is Thermal Equilibrium?

  Objects are in thermal equilibrium when there is no transfer of heat energy between the objects
• Absorption and Radiation of Heat

  The ability of an object to absorb or radiate heat depends on the type and colour of its surface
• Dark objects absorb and radiate heat better than white objects
• Green Building Concept


  • Idea developed to reduce the effects of rapid development on the environment and our health
  • High energy efficiency through the usage of solar energy or renewable energy
  • Good water flow system, air circulation and lighting
  • Uses recycled materials
• The amount of heat depends on?

  Type of material, quantity of material and temperature
• Temperature depends on?

  The degree of movement of the particles in a matter