Heat Transfer: Convection

Poll

How much do you already know about how heat is transferred (moved from place to place)?

• I know a lot.

• I know a little.

• I know nothing about it.

Open Ended

What do you think is causing the up and down movement in the lava lamp?

Multiple Choice

Particles that are in motion have ___________.

• kinetic energy

• density

• temperature

• mass

Multiple Choice

_________ is the total amount of kinetic energy in a substance.

• Pressure

• Thermal energy

• Mass

• Volume

Multiple Choice

TRUE or FALSE? Heat transfers between objects that have different temperatures.

• True

• False

Multiple Choice

Heat energy moves always moves from _____ to _____ temperature.

• high, low

• low, high

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Multiple Choice

Which of the following is the best description of convection?

• Heat transfer between two objects that are touching

• Heat transfer through movement in fluids

• Heat transfer through empty space.

Multiple Choice

Which of the following is an example of heat transfer through convection?

• Feeling heat from a campfire

• Water boiling

• A metal spoon getting warm from sitting in hot water

Multiple Choice

What causes convection currents to form in the ocean?

• Differences in water density

• Differences in ocean depth

• Change in wind speeds

​Lava Lamps and Convection

​How does it work?

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Multiple Select

In order for a lava lamp to work, what is needed?

Select ALL the properties needed!

• Liquids that have different densities

• Liquids that mix easily

• Liquids that do not mix

• Heat

• Different amounts of liquids

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Multiple Choice

When air is heated, what happens to its mass?

• increases

• decreases

• remains the same

Multiple Choice

Water particles ____________ as they gain kinetic energy and push farther apart.

• compress

• expand

• circulate

• get smaller

Multiple Choice

When air is heated, its density ___________.

• increases

• decreases

• remains the same

Multiple Choice

The diagram shows a refrigerator. The cooling unit is placed at the top. The cooling unit cools the air near it. What happens to the density of the air as it cools, and how does it move?

• The density of air increases. It moves down.

• The density of air increases. It moves up.

• The density of air decreases. It moves down.

• The density of air increases. It moves up.

Multiple Choice

In the process of convection, energy is transferred _________.

• because of temperature differences in a solid

• because of density differences in a liquid

• by the diffusion of molecules throughout a fluid

• by the vibration of molecules

Multiple Choice

Which of the following correctly shows the direction of convection currents in water?

• A

• B

• C

• D

Multiple Choice

Some dye in a beaker of water is gently heated. Why are the streaks of dye seen in the water?

• The hot dye is a better conductor than the cool water.

• The hot dye is a better convector than the cool water.

• The hot water is less dense than the cool water.

• The hot water is denser than the cool water.

Poll

How confident do you feel in your ability to explain how heat is transferred through convection?

• Very confident

• A little confident

• I still don't really understand