Convection Flashcards
1
Q
What states of matter can convection occur in?
A
Liquids and gases (fluids)
2
Q
Why can’t convection happen in solids?
A
Particles can’t move. They only vibrate in fixed positions.
3
Q
What are the particles like at a low density?
A
Particles are far apart
4
Q
What are the particles like at a high density?
A
Particles are close together
5
Q
When particles (in a fluid) are heated, what happens to them?
A
- They gain kinetic energy
- They move faster and further apart
- They become less dense and rise
6
Q
When particles are far from the heat source, what happens to them?
A
- They cool down
- They lose kinetic energy
- They move slower and closer together
- They become more dense and sink
7
Q
What happens to less dense fluids?
A
They rise
8
Q
What happens to more dense fluids?
A
They sink
9
Q
What is a convection current?
A
Convection current is the circular motion of hotter fluids rising and cooler fluids sinking.
10
Q
Give 4 examples of real life convection currents.
A
- Electric heater
- Open lid freezer
- Air conditioner
- Kettle
11
Q
How does convection work in an open lid freezer?
A
- The air above the freezer is cool.
- The cold air sinks to the bottom of the freezer
- Any warm air in the freezer is less dense.
- It will rise out of the freezer.
