# Physics P1 1.5 Convection.

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What is convection?
Convection is the circulation of a fluid (liquid or gas) caused by heating it.
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Where does convection take place?
Convection only takes place in liquids and gases (fluids).
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What happens to a liquid or a gas when it is heated?
It becomes less dense so it rises and causes circulation.
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What are fluids?
Liquids and gases.
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What happens during convection?
Fluids is heated and expands, the fluid becomes less dense and rises, the warm fluid is replaced by cooler, denser fluid and the resulting convection current transfers energy throughout the fluid.
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How big are convection currents?
Convection currents can be on a very small scale, such as heating water in a beaker, or a very large scale, such as heating the air above land and sea.
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What are convection currents responsible for within our environment?
Onshore and offshore breezes.
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Why doesn't convection occur in solids?
Convection does not occur in solids because the particles are held in fixed positions and not able to flow.
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Why does a fluid become less dense when it is heated?
A fluid becomes less dense when heated because it expands, so there is the same mass of material in a larger volume.
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**MAKE SURE YOU CAN EXPLAIN HOW CONVECTION CURRENTS ARE ET UP IN TERMS OF THE CHANGES IN DENSITY WHEN FLUID IS HEATED**
*REMEMBER THAT CONVECTION CANNOT OCCUR IN SOLIDS**
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## Other cards in this set

### Card 2

#### Front

Where does convection take place?

#### Back

Convection only takes place in liquids and gases (fluids).

### Card 3

#### Front

What happens to a liquid or a gas when it is heated?

What are fluids?

### Card 5

#### Front

What happens during convection?