Thermal Transfer Flashcards
What are the 4 ways that thermal energy can transfer?
- conduction
- convection
- radiation (infra-red)
- evaporation
What will heat energy do until it reaches thermal equilibrium?
It will continue to move from areas of high temp. to areas of low temp. until the areas are at the same temperature.
Match up the correct answer: The method of heat transfer that can travel through a vacuum.
A) Conduction
B) Convection
C) Radiation (infra-red)
D) Evaporation
C
(T or F) Infra-red radiation isn’t an electromagnetic wave.
False
Conduction is the transfer of thermal energy through ……….
particle collisions
Why does wood feel warmer than copper metal when heated?
Wood feels warmer because it is a poor conductor, meaning it cannot conduct heat away from your hand as quickly as a good conductor (such as copper metal)
Give an explanation as to why metal is a good conductor, relating to the electrons found in atoms.
- metals (being solids) have lots of particles, therefore also atoms and so they have lots of electrons, which move around and vibrate
- the heat energy created is passed on by neighbouring electrons which vibrate through the metal
(T or F) Most non-metal solids are good conductors and therefore transfer heat well.
False, it is the exact opposite. They are poor conductors and do not transfer heat well
How is heat energy passed around in non-metals? What does this allow?
Via neighbouring particles that vibrate. This allows a flow of energy from hot to cold.
Are liquids good conductors? Explain your answer
No, most liquids are poor conductors because their particles are not organised & therefore don’t transfer heat well
(T or F) Poor Conductor = Good Insulator
True
Rank these in order of best conductor to worst conductor: metals, liquids, vacuum, gases, non-metal solids
1) metals
2) non-metal solids
3) liquid
4) gases
5) vacuum
