L6 Convection

LESSON 6: HEAT TRANSFER - CONVECTION

UNIT 5 ENERGY

I CAN explain how thermal energy is transferred from one object to another through conduction, convection, and radiation

Open Ended

What is radiation?

A Closer Look at Convection

Open Ended

What happened and why do you think so?

Convection Tank Demo

Draw

Draw your hypothesis.  What do you think will happen?

It should be color specific!

Convection Tank Demo

Draw

Draw what actually happened.

Was your hypothesis correct?

Open Ended

Explain what happened.

convection currents

Eureka! Convection

CONVECTION

Energy can also be transferred through the movement
of gases or liquids. Convection is the process that
transfers energy by the movement of large numbers of
particles in the same direction within a liquid or gas.

As the kinetic energy
of particles increases,
the particles spread out.
An increased distance
between particles causes
a decrease in the density
of the substance.

CONVECTION

When looking at convection in liquids, warm water is less
dense than cold water, so the warm water is pushed
upward as cooler, denser water moves underneath.
When the warm water that has been pushed up cools,
its density increases. The
cycle continues when this
more dense water sinks, pushing
warmer water up again.

CONVECTION IN REAL LIFE

CONVECTION IN REAL LIFE

Which of

these have

you

experienced?

Multiple Choice

Heat flow (convection current) in the ocean and the atmosphere is...

• cool flows down - warm flows up

• cool flows up - warm flows down

• cool flows up - warm flows up

• cool flows down - warm flows down

Multiple Choice

Convection currents occur when ______________________ energy transfers between a fluid.

• potential

• kinetic

• thermal/heat

• electric

Multiple Choice

When air is heated it becomes...

• More dense

• Less dense

• Heavier

• Moist

Multiple Choice

When air moves into the upper atmosphere it becomes...

• Cool and heavy

• Cool and light

• Warm and heavy

• Warm and light

Multiple Choice

What drives our Convection Currents and effects our Climate Zones on Earth?

• Mountains

• Moon

• Oceans

• Sun