Insulation and lubrication

• What is the main focus of today's video?

  Reducing unwanted energy transfers
• What are the two methods discussed for reducing energy loss?

  Thermal insulation and lubrication
• What is convection?

  Heat transfer through liquids and gases
• How do foam seals help in energy conservation?

  They prevent air from escaping the home
• Why do we need to reduce heat energy loss in homes?

  To keep homes warm in cold weather
• What is conduction?

  Heat loss through a solid
• What materials are used for thick walls to reduce heat loss?

  Materials with low thermal conductivity
• What are cavity walls?

  Two layers of bricks with an air gap
• Why is air considered a poor conductor of heat?

  Because it does not transfer heat well
• What is the purpose of insulating foam in cavity walls?

  To reduce convection and conduction
• What is the difference between single and double glazing?

  Single has one pane, double has two
• How does double glazing reduce heat loss?

  By having an air gap between glass layers
• What is friction?

  Resistance when moving over a solid
• How does friction affect energy transfer?

  It reduces efficiency and heats objects
• How can lubrication help in reducing friction?

  By adding oil to moving parts
• What is the effect of streamlining on vehicles?

  It reduces air resistance and fuel use
• What is the main benefit of reducing friction in vehicles?

  Improved efficiency and easier movement
• What are the key methods to reduce unwanted energy transfers?

  • Thermal insulation
  • Lubrication
• What adaptations do buildings have to reduce heat loss?

  • Sealed homes to prevent air loss
  • Thick walls with low thermal conductivity
  • Cavity walls with insulating foam
  • Double glazing to reduce conduction
• How does lubrication and streamlining improve energy efficiency?

  • Lubrication reduces friction in moving parts
  • Streamlining reduces air resistance in vehicles