Conductors and Insulators
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  • 1. Transfer of Thermal Energy Remember… HEAT ALWAYS FLOWS FROM HOTTER MATERIALS TO COOLER MATERIALS, NEVER THE OTHER WAY! *When warmer objects are put together with cooler ones, the warmer objects lose heat and the cooler ones gain heat until all the objects are at the same temperature.
  • 2. * EXAMPLE OF HEAT TRANSFER (review) When you hold your hands around a mug of hot chocolate, your body gets warmed. This happens because heat flows from the hot mug into your skin. Thermal energy is transferred from the cup to your hands. Your body gains energy, and your temperature rises as a result. Energy is lost from the mug, however. It’s temperature decreases.
  • 3. How does heat move? (review) Heat can move in three ways: conduction convection radiation
  • 4. Conduction (review) In conduction thermal energy flows through objects as their particles vibrate. It usually occurs in solids and between objects that are touching. Example: Mug of hot chocolate to your hand.
  • 5. Conductors A material through which heat can move easily is called a conductor. Iron, silver, aluminum, stainless steel, and copper are all examples of metals that are good conductors.
  • 6. Insulators A material that heat does not move through easily is an insulator. Plastic, wood, rubber, and glass are all good insulators. Many cooking utensils and handles are made out of plastic, wood, or rubber.
  • 7. Insulators Some cooking pots are made of glass. Food will heat more slowly than in a metal one, but it will stay hot longer. Other good insulators are leather and ceramics.
  • 8. Insulators Air is a good insulator. ****It can help slow heat loss from a heated house to the cold air outside. Fluffy material called insulation is made up of many air spaces. When put inside walls of a house, the insulation helps keep the house warm.