SCIENCE LITERACYThird Grade: Unit 2

Heat Transfer

heat energy moleculestransfer

radiation convection

Unit 2

Unit 2

Once upon a time, a King had a brilliant idea…

Unit 2

1. My knowledge. 2. My ideas.

3. My illustration.

4. My learning.

How does a hot air balloon work?

Unit 2Did you know that the first hot air balloon was not piloted by

people? Everyone thought it was too dangerous for people

to travel that high in the air so they decided to use a sheep,

a duck and a chicken! Imagine the squawks (and the

stench) during this first balloon flight in 1783. Not only was

it filled with barn animals, but it was powered by burning

manure, straw, and other items in a fire pit. That made for

some pretty smelly smoke! The balloon was in flight for

over eight minutes and reached a mile high. That’s 5,208

feet in the air!

Though this flight sounds like something out of a

fairytale, it was important in two ways: First, it was the

first successful flight of a hot air balloon and second,

it proved to King Louis XVI that the atmosphere at

higher elevations was breathable for human beings.

Until then, no one had ever traveled that high in the

air. Hot air ballooning has come a long way since this

early flight, but the history is remarkable.

Unit 2

After that...

Lastly...

Begin here.Next...

Then...

Convection

Unit 2

Radiation is the process through which the heat

emitted from a hot surface is transferred across

space. The Sun, which is a VERY hot surface, emits

heat toward the Earth and solar system continuously.

Only about 25% of the Sun’s radiant energy reaches

the surface of the Earth. The remaining 75% is

absorbed by the atmosphere or reflected back into

space.

Light bulbs also emit heat through radiation. The heat

travels out in all directions, a result of the hot wire

inside the bulb that glows. In older light bulbs, more

than 90% of the light energy was converted to heat.

This made the bulbs dangerous to touch and fire

hazards in the home.

Unit 2

What is it? (definition)

What does it look like? (illustration)

What are some words that relate

to it? (association)

What does it do? (explanation)

Radiation

Ye Royal Report on Hot Air Balloon TravelBy Captain Rooster, Co-Pilot Duck, and Navigator

Sheep 

How Yon Balloon Lifted into the Air

    

How Yon Balloon Traveled Through

the Air

    

How Yon Balloon was Brought Back

to Earth

    

How Yon Animals Felt About Being Up

in the Air

    

heat flame lift descend float hot air riseconvection molecules expand contract atmosphere