Moving heat

Moving heat

How does heat move around?

Open Ended

Quick review: WHY does the food coloring move differently in hot and cold water?

Multiple Choice

When air warms up its molecules move _______.

• faster

• slower

• the same

Heat ALWAYS moves from hot to cold and stops when both are the same temperature. The warm material cools down and the cold material warms up.

One direction

Heat ALWAYS moves from hot to cold. "Cold" isn't a thing, it can't move.

Three types of heat transfer (movement)

• Conduction

• Convection

• Radiation

Multiple Select

What are the three ways heat moves? (choose all 3)

• Condensation

• Convection

• Radiation

• Insulation

• Conduction

Multiple Choice

Which way does heat move?

• Hot to cold

• Cold to hot

• Both ways

Multiple Choice

Does cold move?

• Yes

• No

• Sometimes

Conduction

• In conduction molecules collide to transfer heat

• When a fast moving molecule bumps into a slower one, the slower molecule speeds up and is warmer.

• Objects or materials have to touch for conduction

The next slide links you to a simulation

Watch the simulation to she how heat (red color) transfers from one material to another when molecules collide

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Conductors and Insulators

• Conductors = materials that transfer heat well (like metals)

• Insulators = materials that DON'T transfer heat well (like air, insulation, and fabric)

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Multiple Choice

In the video you just watched: Which material do you think is a good heat conductor?

• Left

• Right

Open Ended

What are some daily activities where you want to use a good head conducting material?

Multiple Choice

In the video you just watched: Which material do you think is a good heat insulator?

• Left

• Right

Open Ended

What are some daily activities where you want a good heat insulating material?

Multiple Choice

Is blubber a good heat conductor or insulator? (Remember the blubber mitt demonstration in class, blubber is a layer of fat found in animals that live in cold water)

• Conductor

• Insulator

Multiple Choice

Do you think the fur of a polar bear is a good insulator or conductor?

• Conductor

• Insulator

Insulators

• materials with lots of trapped air make good insulators

• This microscope image shows the small air spaces in insulation

Convection

• Convection happens when warm air or a warm liquid rises and cooler air or liquid takes its place

• This happens in the oceans and atmosphere to cause currents

• It happens in our houses when it is warmer near the ceiling.

Multiple Choice

Which is an example of convection?

• Warm air rising at the equator

• touching a hot pan

• the sun warming up a car

• Gloves keeping your hands warm

Radiation

• Radiation is the movement of heat through electromagnetic waves (light)

• This is how sunlight warms the earth

• This is also the heat an infrared or night vision goggles use

Radiant heat transfer happens when objects DON'T touch

Multiple Choice

What kind of heat transfer happens when objects DON'T touch?

• Radiation

• Conduction

• Convection

Multiple Choice

What kind of heat transfer happens when objects touch?

• Radiation

• Conduction

• Convection

Fennec fox

Poll

The fennec fox's big ears help it cool off in the desert. What kind of heat transfer do you think the fox is using to get rid of extra heat?

• Convection

• Conduction

• Radiation

Lizard sunning on warm rock

Poll

When a lizard lays on a warm rock to warm up what kinds of heat transfer do you think it is using?

• Convection

• Conduction

• Radiation

Microscopic image of reindeer hair

This image shows what reindeers hollow hairs look like on the inside

Multiple Choice

Do you think reindeer hair is a good insulator or conductor?

• Insulator

• Conductor

States of matter

Review how the molecules are space differently in different states of matter.

Remember to conduct heat molecules must touch or collide.

More molecules = more collisions

Multiple Choice

Which state of matter will be a good insulator?

• Solid

• Liquid

• Gas