Conduction and convection Flashcards
1
Q
what is a conductor
A
a material that allows thermal energy to pass through it easily
2
Q
what is thermal conductivity
A
how quickly energy is transferred through a material through heating
3
Q
what state of matter does conduction mainly take place in
A
solids
4
Q
what state of matter does convection happen in
A
liquids and gases
5
Q
what is convection
A
where energetic particles move away from hotter to cooler regions
6
Q
why is heating a solid different to heating a liquid or gas
A
- the gas and liquids are able to move around, so when you heat it, they move faster and the space between individual particles increases
7
Q
how is a convection current created
A
when there is a constant heat source such as a radiator
8
Q
how do radiators create convection currents
A
- energy is transferred from the radiator to nearby air particles by conduction ( the air particles collide with radiator surface)
- the air by the radiator becomes warmer and less dense ( particles move quicker)
- the warm air rises and is replaced by cooler air, the cooler air is then heated by the radiator
-at the same time, the previously heated air transfers energy to its surroundings
- the cycle repeats
9
Q
examples of good conductors
A
- ## metals
10
Q
examples of good insulators
A
glass
air
