C1 Energy transfer/ radiation Flashcards
What is a vacuum
A space with nothing in it
What surfaces are good at absorbers get infrared radiation?
Dark matt colours
What’s surfaces are good at emiting infrared radiation?
White and shiney
Where does conduction occur
In solids
Where does convection occur
Liquids or gases
What is a poor insulator called?
Conduction
Why does fluid become less dense when heated
The particles move around more quickly and spread out
What 3things increase the rate of evaporation
Heat
Airflow
Wide surface area
What 2 things increase the rate of condensation
Heat
Surface area
What gives off infrared radiation
All objects emit radiation
How can the structure of the vacuum flask minimise energy transfer by conduction,convection and radiation
The vacuum has no molecules so conduction or convection can’t occur.
Plastic is a good insulator
Shiney inside to reflect heat loss
What does this for
E= m x c x 0
Energy= mass x capacity x change of temperature
