P1 - Conduction and Convection

• What is Conduction?

  Process in which vibrating particles transfer energy, to neighbouring particles.
• What is Convection?

  When energetic particles move away from hotter to cooler regions
• A convection current is set up around the can-chiller. Explain how.

  • Air particles spread out
  • Causes the air to become less dense
  • So the warm air rises
• How is Double Glazing fitted?

  Window has two panes of glass and a gap inbetween.
• What method of heat transfer does Double Glazing prevent?

  Conduction
• How does Double Glazing prevent conduction?

  • Particles in glass are tightly packed together.
  • Particles are trapped, so they cannot collide.
• How is Loft Insulation fitted?

  Thick mineral wool rolls laid out in the loft.
• What method of heat transfer does Loft Insulation prevent?

  Conduction & Convection
• How does Loft Insulation prevent conduction & convection?

  It prevents heat escaping from the upper rooms out of the roof
• What method of heat transfer does Draught Excluders prevent?

  Convection
• How do Draught Excluders prevent convection?

  • Prevents air from entering a room
  • Prevents air from mixing and energy from being transferred by convection.
• What is meant by a high thermal conductivity?

  The higher the thermal conductivity of a material, the higher the rate of energy transfer across the material.