1.5 Convection Flashcards Preview

GCSE Physics 1.1 Energy Transfer By Heating > 1.5 Convection > Flashcards

Flashcards in 1.5 Convection Deck (13)
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1
Q

What are fluids?

A

Gases and liquids

2
Q

What happens when a fluid is heated and why?

A

It expands because the particles are colliding harder

3
Q

What happens when the fluid expands?

A

It becomes less dense and rises

4
Q

What replaces the warm fluid in a convection current?

A

Cooler, denser fluid

5
Q

What happens to the warm fluid after it rises?

A

It loses energy so the particles collide less so the fluid contracts and sinks as it is more dense

6
Q

What is the purpose of a convection current?

A

To transfer energy throughout the fluid

7
Q

Why doesn’t convection occur in solids?

A

Because the particles are held in fixed positions and aren’t able to flow

8
Q

Name a small scale convection current

A

•heating water in a beaker

9
Q

Name a large scale convection current

A

•heating the air above land and sea

10
Q

Why should you keep a lid on beakers for experiments?

A

To keep the hot air from evaporating

11
Q

What is responsible for offshore and onshore breezes?

A

Convection currents

12
Q

Why does a fluid become less dense when it is heated?

A

Because it expands and there is the same mass in a bigger volume

13
Q

Where does convection occur?

A

In fluids