Thermal Transfer Flashcards
Where will heat energy move and how long does this last for?
From areas of high temperature to areas of low temperature. It continues until the areas are in thermal equilibrium (same temperature)
What are the 4 different ways that thermal energy can transfer?
Conduction, convection, infra-red radiation, evaporation
Where can infra-red radiation travel through that other methods of heat transfer can’t?
A vacuum
How can IR radiation be detected?
An infra-red camera
Which colours show what on an infra-red camera?
Blue shows colder areas and red shows hotter areas
What is IR radiation?
An electromagnetic wave
Where does conduction tend to happen best and why?
In solids because the particles are close together
How is heat transferred in conduction?
By collision of particles
What temperature would metal feel like?
Colder/warmer depending on room temperature
Why are metals good conductors of heat?
They have atoms inside them and lots of free electrons. The free electrons are able to move around and vibrate. Heat energy is passed on by neighbouring electrons vibrating along the metal.
How is heat energy passed on in a non-metal?
By neighbouring particles vibrating along the non-metal. This allows a flow of energy from hot to cold.
Why are most liquids bad conductors?
Their particles are not organised and therefore do not transfer heat well as less collision and vibration is occuring
