Convection

Question 0

What happens when a fluid is heated?

Answer 0

Expands
Less dense than colder air
Warm air rises

Question 1

Which states transfer by convection?

Answer 1

Gas or liquid moves, carries heat with it

Question 2

What do we call it when a warmer liquid floats over a cooler one (and so on)?

Answer 2

Convection current

Question 3

Freezers in supermarkets are often left open.

Answer 3

Any hot air in the freezer will rise

Cool air will stay in freezer because denser

Question 4

Hot air balloon rises in air.

Answer 4

Hot air in balloon less dense that normal air

Hot air has expanded

Question 5

Ice cubes cool whole drink.

Answer 5

Cold liquid (cooled by cube) sinks because denser
Warm liquid rises because less dense
Process continues

Question 6

The heating element in the kettle is at the bottom.

Answer 6

Heated water rises to the top because less dense
Cold water sinks to bottom because more dense
Process continues

Question 7

Birds can fly for hours without flapping their wings.

Answer 7

Convection current in air

Hot air rising keeps bird up