Insulation Flashcards
What is convection?
These currents enable hot air balloons to rise.
What is insulation?
Ways of reducing unwanted energy transfers and therefore loss of heat caused by electricity.
Give an example of insulation.
Foam cavity wall insulation.
How does foam cavity wall insulation work?
It cuts down energy transfers between warm inner walls and colder outer walls by trapping air pockets.
Why is air a good insulator?
It traps heat, preventing convection from taking place.
What is the function of double glazing in windows?
It traps a small layer of air between two panes of glass.
How does double glazing reduce heat loss?
It reduces heat loss by conduction and convection.
What is an effective feature of some double glazing?
Some double glazing uses a vacuum.
What is the effect of a vacuum in double glazing?
It is more effective in preventing heat loss by convection.
How do humans regulate temperature when it’s too hot?
By sweating, which cools the body as water evaporates.
What happens when sweat evaporates from the skin?
Higher energy escapes, helping you lose heat.
How do humans regulate temperature when it’s too cold?
By shivering, which generates energy through movement.
